[
  {
    "Z": 1,
    "symbol": "H",
    "mass_amu": 1.008,
    "compton_freq_Hz": 2.2704463155955327e+23,
    "energy_eV": 939074737.024719,
    "log10_E": 8.972700157320213,
    "d_eff": 3.3174,
    "block": "s",
    "period": 1,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 0.0,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 2,
    "symbol": "He",
    "mass_amu": 4.003,
    "compton_freq_Hz": 9.016464882270752e+23,
    "energy_eV": 3729281916.9741573,
    "log10_E": 9.571625215315812,
    "d_eff": 3.3811,
    "block": "s",
    "period": 1,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 0.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 3,
    "symbol": "Li",
    "mass_amu": 6.941,
    "compton_freq_Hz": 1.5634095115623602e+24,
    "energy_eV": 6466386656.4370775,
    "log10_E": 9.810661669613065,
    "d_eff": 3.4064,
    "block": "s",
    "period": 2,
    "d_pos": 0,
    "cone_position": "peak",
    "base_archetype": "BCC",
    "SO_meV": 0.2,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 4,
    "symbol": "Be",
    "mass_amu": 9.012,
    "compton_freq_Hz": 2.0298871226336253e+24,
    "energy_eV": 8395775327.447191,
    "log10_E": 9.9240608082625,
    "d_eff": 3.4185,
    "block": "s",
    "period": 2,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "HCP",
    "SO_meV": 0.3,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 5,
    "symbol": "B",
    "mass_amu": 10.81,
    "compton_freq_Hz": 2.4348734793241774e+24,
    "energy_eV": 10070831257.179775,
    "log10_E": 10.003065319164017,
    "d_eff": 3.4268,
    "block": "p",
    "period": 2,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 0.3,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "icosahedral",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 6,
    "symbol": "C",
    "mass_amu": 12.01,
    "compton_freq_Hz": 2.7051647073712644e+24,
    "energy_eV": 11188777372.685392,
    "log10_E": 10.048782632613612,
    "d_eff": 3.4317,
    "block": "p",
    "period": 2,
    "d_pos": 0,
    "cone_position": "slope-mid",
    "base_archetype": "Diamond",
    "SO_meV": 0.4,
    "spiral_corrected": false,
    "archetype": "Diamond",
    "coordination": 4,
    "stacking": "tetrahedral",
    "eigenvalue_family": "{2\u00b2}",
    "eigenvalue_ratios": [
      4
    ],
    "properties": {
      "conductor": "no",
      "ductility": "brittle",
      "hardness": "extremely hard",
      "freq_response": "gapped",
      "thermal_expansion": "low",
      "nobility": "inert",
      "cohesive_energy": "very high (covalent)",
      "catalytic": "inert",
      "magnetism": "none",
      "superconductor": "none",
      "band_gap": "yes (0.08-5.5 eV)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "very high",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "high",
      "oxidation_states": "+4"
    },
    "hypothetical": false
  },
  {
    "Z": 7,
    "symbol": "N",
    "mass_amu": 14.01,
    "compton_freq_Hz": 3.155650087449743e+24,
    "energy_eV": 13052020898.528088,
    "log10_E": 10.115677760496482,
    "d_eff": 3.4388,
    "block": "p",
    "period": 2,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 0.6,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 8,
    "symbol": "O",
    "mass_amu": 16.0,
    "compton_freq_Hz": 3.6038830406278297e+24,
    "energy_eV": 14905948206.741573,
    "log10_E": 10.173359607866631,
    "d_eff": 3.4449,
    "block": "p",
    "period": 2,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 0.9,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 9,
    "symbol": "F",
    "mass_amu": 19.0,
    "compton_freq_Hz": 4.2796111107455474e+24,
    "energy_eV": 17700813495.505615,
    "log10_E": 10.247993226163535,
    "d_eff": 3.4528,
    "block": "p",
    "period": 2,
    "d_pos": 0,
    "cone_position": "approach-near",
    "base_archetype": "other",
    "SO_meV": 1.2,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 10,
    "symbol": "Ne",
    "mass_amu": 20.18,
    "compton_freq_Hz": 4.54539748499185e+24,
    "energy_eV": 18800127175.752808,
    "log10_E": 10.274160787111597,
    "d_eff": 3.4555,
    "block": "p",
    "period": 2,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 1.6,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 11,
    "symbol": "Na",
    "mass_amu": 22.99,
    "compton_freq_Hz": 5.178329444002113e+24,
    "energy_eV": 21417984329.561794,
    "log10_E": 10.330778596479986,
    "d_eff": 3.4615,
    "block": "s",
    "period": 3,
    "d_pos": 0,
    "cone_position": "peak",
    "base_archetype": "BCC",
    "SO_meV": 2.4,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 12,
    "symbol": "Mg",
    "mass_amu": 24.31,
    "compton_freq_Hz": 5.475649794853908e+24,
    "energy_eV": 22647725056.617973,
    "log10_E": 10.355024584054043,
    "d_eff": 3.4641,
    "block": "s",
    "period": 3,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "HCP",
    "SO_meV": 2.9,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 13,
    "symbol": "Al",
    "mass_amu": 26.98,
    "compton_freq_Hz": 6.077047777258678e+24,
    "energy_eV": 25135155163.617977,
    "log10_E": 10.400281570546593,
    "d_eff": 3.4689,
    "block": "p",
    "period": 3,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "FCC",
    "SO_meV": 3.0,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 14,
    "symbol": "Si",
    "mass_amu": 28.09,
    "compton_freq_Hz": 6.327067163202233e+24,
    "energy_eV": 26169255320.460674,
    "log10_E": 10.417791364412285,
    "d_eff": 3.4707,
    "block": "p",
    "period": 3,
    "d_pos": 0,
    "cone_position": "slope-mid",
    "base_archetype": "Diamond",
    "SO_meV": 3.7,
    "spiral_corrected": false,
    "archetype": "Diamond",
    "coordination": 4,
    "stacking": "tetrahedral",
    "eigenvalue_family": "{2\u00b2}",
    "eigenvalue_ratios": [
      4
    ],
    "properties": {
      "conductor": "no",
      "ductility": "brittle",
      "hardness": "extremely hard",
      "freq_response": "gapped",
      "thermal_expansion": "low",
      "nobility": "inert",
      "cohesive_energy": "very high (covalent)",
      "catalytic": "inert",
      "magnetism": "none",
      "superconductor": "none",
      "band_gap": "yes (0.08-5.5 eV)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "very high",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "high",
      "oxidation_states": "+4"
    },
    "hypothetical": false
  },
  {
    "Z": 15,
    "symbol": "P",
    "mass_amu": 30.97,
    "compton_freq_Hz": 6.975766110515242e+24,
    "energy_eV": 28852325997.674152,
    "log10_E": 10.460180830567493,
    "d_eff": 3.4752,
    "block": "p",
    "period": 3,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 4.4,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 16,
    "symbol": "S",
    "mass_amu": 32.07,
    "compton_freq_Hz": 7.223533069558405e+24,
    "energy_eV": 29877109936.887634,
    "log10_E": 10.475338585139147,
    "d_eff": 3.4768,
    "block": "p",
    "period": 3,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 5.1,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 17,
    "symbol": "Cl",
    "mass_amu": 35.45,
    "compton_freq_Hz": 7.984853361891036e+24,
    "energy_eV": 33025991495.561802,
    "log10_E": 10.518855864729792,
    "d_eff": 3.4814,
    "block": "p",
    "period": 3,
    "d_pos": 0,
    "cone_position": "approach-near",
    "base_archetype": "other",
    "SO_meV": 6.0,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 18,
    "symbol": "Ar",
    "mass_amu": 39.95,
    "compton_freq_Hz": 8.998445467067613e+24,
    "energy_eV": 37218289428.70786,
    "log10_E": 10.570756408860717,
    "d_eff": 3.4869,
    "block": "p",
    "period": 3,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 6.9,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 19,
    "symbol": "K",
    "mass_amu": 39.1,
    "compton_freq_Hz": 8.806989180534257e+24,
    "energy_eV": 36426410930.22472,
    "log10_E": 10.561416382606573,
    "d_eff": 3.4859,
    "block": "s",
    "period": 4,
    "d_pos": 0,
    "cone_position": "peak",
    "base_archetype": "BCC",
    "SO_meV": 7.2,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 20,
    "symbol": "Ca",
    "mass_amu": 40.08,
    "compton_freq_Hz": 9.027727016772713e+24,
    "energy_eV": 37339400257.887634,
    "log10_E": 10.572167338069896,
    "d_eff": 3.487,
    "block": "s",
    "period": 4,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "FCC",
    "SO_meV": 8.0,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 21,
    "symbol": "Sc",
    "mass_amu": 44.96,
    "compton_freq_Hz": 1.0126911344164201e+25,
    "energy_eV": 41885714460.94382,
    "log10_E": 10.622065927771711,
    "d_eff": 3.4923,
    "block": "d",
    "period": 4,
    "d_pos": 1,
    "cone_position": "plateau-start",
    "base_archetype": "HCP",
    "SO_meV": 9.1,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 22,
    "symbol": "Ti",
    "mass_amu": 47.87,
    "compton_freq_Hz": 1.0782367572178385e+25,
    "energy_eV": 44596733791.04494,
    "log10_E": 10.649303052692655,
    "d_eff": 3.4952,
    "block": "d",
    "period": 4,
    "d_pos": 2,
    "cone_position": "plateau-start",
    "base_archetype": "HCP",
    "SO_meV": 10.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 23,
    "symbol": "V",
    "mass_amu": 50.94,
    "compton_freq_Hz": 1.1473862630598852e+25,
    "energy_eV": 47456812603.21348,
    "log10_E": 10.676298565838303,
    "d_eff": 3.498,
    "block": "d",
    "period": 4,
    "d_pos": 3,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 11.4,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 24,
    "symbol": "Cr",
    "mass_amu": 52.0,
    "compton_freq_Hz": 1.1712619882040446e+25,
    "energy_eV": 48444331671.91011,
    "log10_E": 10.685242968845506,
    "d_eff": 3.499,
    "block": "d",
    "period": 4,
    "d_pos": 4,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 12.7,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 25,
    "symbol": "Mn",
    "mass_amu": 54.94,
    "compton_freq_Hz": 1.2374833390755811e+25,
    "energy_eV": 51183299654.89887,
    "log10_E": 10.70912828029525,
    "d_eff": 3.5015,
    "block": "d",
    "period": 4,
    "d_pos": 5,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 14.1,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 26,
    "symbol": "Fe",
    "mass_amu": 55.85,
    "compton_freq_Hz": 1.2579804238691518e+25,
    "energy_eV": 52031075459.1573,
    "log10_E": 10.716262802662335,
    "d_eff": 3.5023,
    "block": "d",
    "period": 4,
    "d_pos": 6,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 15.5,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 27,
    "symbol": "Co",
    "mass_amu": 58.93,
    "compton_freq_Hz": 1.3273551724012372e+25,
    "energy_eV": 54900470488.95505,
    "log10_E": 10.739576066305856,
    "d_eff": 3.5047,
    "block": "d",
    "period": 4,
    "d_pos": 7,
    "cone_position": "plateau-mid",
    "base_archetype": "HCP",
    "SO_meV": 17.0,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 28,
    "symbol": "Ni",
    "mass_amu": 58.69,
    "compton_freq_Hz": 1.3219493478402957e+25,
    "energy_eV": 54676881265.85393,
    "log10_E": 10.73780373472428,
    "d_eff": 3.5045,
    "block": "d",
    "period": 4,
    "d_pos": 8,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 18.7,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 29,
    "symbol": "Cu",
    "mass_amu": 63.55,
    "compton_freq_Hz": 1.431417295199366e+25,
    "energy_eV": 59204563033.65168,
    "log10_E": 10.772355180100734,
    "d_eff": 3.5082,
    "block": "d",
    "period": 4,
    "d_pos": 9,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 20.4,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 30,
    "symbol": "Zn",
    "mass_amu": 65.38,
    "compton_freq_Hz": 1.4726367074765467e+25,
    "energy_eV": 60909430859.797745,
    "log10_E": 10.784684541455057,
    "d_eff": 3.5095,
    "block": "d",
    "period": 4,
    "d_pos": 10,
    "cone_position": "plateau-end-late",
    "base_archetype": "HCP",
    "SO_meV": 22.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 31,
    "symbol": "Ga",
    "mass_amu": 69.72,
    "compton_freq_Hz": 1.5703920349535765e+25,
    "energy_eV": 64952669310.876396,
    "log10_E": 10.812597003648662,
    "d_eff": 3.5124,
    "block": "p",
    "period": 4,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 26.8,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 8,
    "stacking": "orthorhombic",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 32,
    "symbol": "Ge",
    "mass_amu": 72.63,
    "compton_freq_Hz": 1.6359376577549953e+25,
    "energy_eV": 67663688640.97752,
    "log10_E": 10.830355669372102,
    "d_eff": 3.5143,
    "block": "p",
    "period": 4,
    "d_pos": 0,
    "cone_position": "slope-mid",
    "base_archetype": "Diamond",
    "SO_meV": 29.0,
    "spiral_corrected": false,
    "archetype": "Diamond",
    "coordination": 4,
    "stacking": "tetrahedral",
    "eigenvalue_family": "{2\u00b2}",
    "eigenvalue_ratios": [
      4
    ],
    "properties": {
      "conductor": "no",
      "ductility": "brittle",
      "hardness": "extremely hard",
      "freq_response": "gapped",
      "thermal_expansion": "low",
      "nobility": "inert",
      "cohesive_energy": "very high (covalent)",
      "catalytic": "inert",
      "magnetism": "none",
      "superconductor": "none",
      "band_gap": "yes (0.08-5.5 eV)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "very high",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "high",
      "oxidation_states": "+4"
    },
    "hypothetical": false
  },
  {
    "Z": 33,
    "symbol": "As",
    "mass_amu": 74.92,
    "compton_freq_Hz": 1.687518233773981e+25,
    "energy_eV": 69797102478.06741,
    "log10_E": 10.843837393913907,
    "d_eff": 3.5157,
    "block": "p",
    "period": 4,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "A7",
    "SO_meV": 31.3,
    "spiral_corrected": false,
    "archetype": "A7",
    "coordination": 6,
    "stacking": "layered",
    "eigenvalue_family": "{2,3} partial",
    "eigenvalue_ratios": [
      2,
      3
    ],
    "properties": {
      "conductor": "no",
      "ductility": "variable",
      "hardness": "moderate",
      "freq_response": "semimetallic",
      "thermal_expansion": "variable",
      "nobility": "poor metal",
      "cohesive_energy": "moderate",
      "catalytic": "limited",
      "magnetism": "diamagnetic",
      "superconductor": "none-weak",
      "band_gap": "semimetal (overlap)",
      "alloy_compat": "limited",
      "resistivity": "high",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "variable",
      "e_ph_coupling": "low",
      "electronegativity": "moderate",
      "oxidation_states": "variable"
    },
    "hypothetical": false
  },
  {
    "Z": 34,
    "symbol": "Se",
    "mass_amu": 78.97,
    "compton_freq_Hz": 1.778741523239873e+25,
    "energy_eV": 73570170617.89886,
    "log10_E": 10.86670176322377,
    "d_eff": 3.5181,
    "block": "p",
    "period": 4,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 33.7,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "chain",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 35,
    "symbol": "Br",
    "mass_amu": 79.9,
    "compton_freq_Hz": 1.7996890934135225e+25,
    "energy_eV": 74436578857.41573,
    "log10_E": 10.871786404524698,
    "d_eff": 3.5187,
    "block": "p",
    "period": 4,
    "d_pos": 0,
    "cone_position": "approach-near",
    "base_archetype": "other",
    "SO_meV": 36.2,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 36,
    "symbol": "Kr",
    "mass_amu": 83.8,
    "compton_freq_Hz": 1.8875337425288258e+25,
    "energy_eV": 78069903732.80899,
    "log10_E": 10.892483643840983,
    "d_eff": 3.5209,
    "block": "p",
    "period": 4,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 38.9,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 37,
    "symbol": "Rb",
    "mass_amu": 85.47,
    "compton_freq_Hz": 1.9251492717653785e+25,
    "energy_eV": 79625712076.88763,
    "log10_E": 10.901053329169846,
    "d_eff": 3.5218,
    "block": "s",
    "period": 5,
    "d_pos": 0,
    "cone_position": "peak",
    "base_archetype": "BCC",
    "SO_meV": 33.3,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 38,
    "symbol": "Sr",
    "mass_amu": 87.62,
    "compton_freq_Hz": 1.973576450123815e+25,
    "energy_eV": 81628698867.16853,
    "log10_E": 10.911842874052864,
    "d_eff": 3.5229,
    "block": "s",
    "period": 5,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "FCC",
    "SO_meV": 35.6,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 39,
    "symbol": "Y",
    "mass_amu": 88.91,
    "compton_freq_Hz": 2.002632757138877e+25,
    "energy_eV": 82830490941.33707,
    "log10_E": 10.918190235456255,
    "d_eff": 3.5236,
    "block": "d",
    "period": 5,
    "d_pos": 1,
    "cone_position": "plateau-start",
    "base_archetype": "HCP",
    "SO_meV": 42.7,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 40,
    "symbol": "Zr",
    "mass_amu": 91.22,
    "compton_freq_Hz": 2.0546638185379415e+25,
    "energy_eV": 84982537213.6854,
    "log10_E": 10.929329693115626,
    "d_eff": 3.5248,
    "block": "d",
    "period": 5,
    "d_pos": 2,
    "cone_position": "plateau-start",
    "base_archetype": "HCP",
    "SO_meV": 45.5,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 41,
    "symbol": "Nb",
    "mass_amu": 92.91,
    "compton_freq_Hz": 2.092729833154573e+25,
    "energy_eV": 86556977993.02246,
    "log10_E": 10.937302085287156,
    "d_eff": 3.5256,
    "block": "d",
    "period": 5,
    "d_pos": 3,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 48.4,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 42,
    "symbol": "Mo",
    "mass_amu": 95.95,
    "compton_freq_Hz": 2.1612036109265016e+25,
    "energy_eV": 89389108152.30336,
    "log10_E": 10.951284604282197,
    "d_eff": 3.5271,
    "block": "d",
    "period": 5,
    "d_pos": 4,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 51.4,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 43,
    "symbol": "Tc",
    "mass_amu": 98.0,
    "compton_freq_Hz": 2.207378362384546e+25,
    "energy_eV": 91298932766.29213,
    "log10_E": 10.960465700903201,
    "d_eff": 3.528,
    "block": "d",
    "period": 5,
    "d_pos": 5,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 54.6,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 44,
    "symbol": "Ru",
    "mass_amu": 101.1,
    "compton_freq_Hz": 2.2772035962967097e+25,
    "energy_eV": 94186960231.34831,
    "log10_E": 10.973990780801708,
    "d_eff": 3.5295,
    "block": "d",
    "period": 5,
    "d_pos": 6,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 57.8,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 45,
    "symbol": "Rh",
    "mass_amu": 102.9,
    "compton_freq_Hz": 2.3177472805037735e+25,
    "energy_eV": 95863879404.60675,
    "log10_E": 10.98165499997314,
    "d_eff": 3.5303,
    "block": "d",
    "period": 5,
    "d_pos": 7,
    "cone_position": "plateau-mid",
    "base_archetype": "FCC",
    "SO_meV": 61.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 46,
    "symbol": "Pd",
    "mass_amu": 106.4,
    "compton_freq_Hz": 2.396582222017507e+25,
    "energy_eV": 99124555574.83145,
    "log10_E": 10.996181253169736,
    "d_eff": 3.5318,
    "block": "d",
    "period": 5,
    "d_pos": 8,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 64.6,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 47,
    "symbol": "Ag",
    "mass_amu": 107.9,
    "compton_freq_Hz": 2.4303686255233924e+25,
    "energy_eV": 100521988219.21347,
    "log10_E": 11.002261069893617,
    "d_eff": 3.5325,
    "block": "d",
    "period": 5,
    "d_pos": 9,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 68.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 48,
    "symbol": "Cd",
    "mass_amu": 112.4,
    "compton_freq_Hz": 2.53172783604105e+25,
    "energy_eV": 104714286152.35954,
    "log10_E": 11.020005936443749,
    "d_eff": 3.5343,
    "block": "d",
    "period": 5,
    "d_pos": 10,
    "cone_position": "plateau-end-late",
    "base_archetype": "HCP",
    "SO_meV": 71.8,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 49,
    "symbol": "In",
    "mass_amu": 114.8,
    "compton_freq_Hz": 2.5857860816504678e+25,
    "energy_eV": 106950178383.37079,
    "log10_E": 11.029181513272661,
    "d_eff": 3.5353,
    "block": "p",
    "period": 5,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "FCC",
    "SO_meV": 84.0,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 50,
    "symbol": "Sn",
    "mass_amu": 118.7,
    "compton_freq_Hz": 2.673630730765771e+25,
    "energy_eV": 110583503258.76404,
    "log10_E": 11.043690344165297,
    "d_eff": 3.5368,
    "block": "p",
    "period": 5,
    "d_pos": 0,
    "cone_position": "slope-mid",
    "base_archetype": "Diamond",
    "SO_meV": 88.4,
    "spiral_corrected": false,
    "archetype": "Diamond",
    "coordination": 4,
    "stacking": "tetrahedral",
    "eigenvalue_family": "{2\u00b2}",
    "eigenvalue_ratios": [
      4
    ],
    "properties": {
      "conductor": "no",
      "ductility": "brittle",
      "hardness": "extremely hard",
      "freq_response": "gapped",
      "thermal_expansion": "low",
      "nobility": "inert",
      "cohesive_energy": "very high (covalent)",
      "catalytic": "inert",
      "magnetism": "none",
      "superconductor": "none",
      "band_gap": "yes (0.08-5.5 eV)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "very high",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "high",
      "oxidation_states": "+4"
    },
    "hypothetical": false
  },
  {
    "Z": 51,
    "symbol": "Sb",
    "mass_amu": 121.8,
    "compton_freq_Hz": 2.7434559646779353e+25,
    "energy_eV": 113471530723.8202,
    "log10_E": 11.054886913507563,
    "d_eff": 3.538,
    "block": "p",
    "period": 5,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "A7",
    "SO_meV": 92.9,
    "spiral_corrected": false,
    "archetype": "A7",
    "coordination": 6,
    "stacking": "layered",
    "eigenvalue_family": "{2,3} partial",
    "eigenvalue_ratios": [
      2,
      3
    ],
    "properties": {
      "conductor": "no",
      "ductility": "variable",
      "hardness": "moderate",
      "freq_response": "semimetallic",
      "thermal_expansion": "variable",
      "nobility": "poor metal",
      "cohesive_energy": "moderate",
      "catalytic": "limited",
      "magnetism": "diamagnetic",
      "superconductor": "none-weak",
      "band_gap": "semimetal (overlap)",
      "alloy_compat": "limited",
      "resistivity": "high",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "variable",
      "e_ph_coupling": "low",
      "electronegativity": "moderate",
      "oxidation_states": "variable"
    },
    "hypothetical": false
  },
  {
    "Z": 52,
    "symbol": "Te",
    "mass_amu": 127.6,
    "compton_freq_Hz": 2.874096724900694e+25,
    "energy_eV": 118874936948.76404,
    "log10_E": 11.07509029959585,
    "d_eff": 3.5401,
    "block": "p",
    "period": 5,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 97.5,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "chain",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 53,
    "symbol": "I",
    "mass_amu": 126.9,
    "compton_freq_Hz": 2.8583297365979473e+25,
    "energy_eV": 118222801714.7191,
    "log10_E": 11.072701247305412,
    "d_eff": 3.5399,
    "block": "p",
    "period": 5,
    "d_pos": 0,
    "cone_position": "approach-near",
    "base_archetype": "other",
    "SO_meV": 102.2,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "molecular",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 54,
    "symbol": "Xe",
    "mass_amu": 131.3,
    "compton_freq_Hz": 2.957436520215213e+25,
    "energy_eV": 122321937471.57304,
    "log10_E": 11.087504351300186,
    "d_eff": 3.5414,
    "block": "p",
    "period": 5,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 107.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 55,
    "symbol": "Cs",
    "mass_amu": 132.9,
    "compton_freq_Hz": 2.993475350621491e+25,
    "energy_eV": 123812532292.24718,
    "log10_E": 11.09276460615344,
    "d_eff": 3.542,
    "block": "s",
    "period": 6,
    "d_pos": 0,
    "cone_position": "peak",
    "base_archetype": "BCC",
    "SO_meV": 89.7,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 56,
    "symbol": "Ba",
    "mass_amu": 137.3,
    "compton_freq_Hz": 3.092582134238757e+25,
    "energy_eV": 127911668049.10114,
    "log10_E": 11.10691016244746,
    "d_eff": 3.5435,
    "block": "s",
    "period": 6,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "BCC",
    "SO_meV": 93.9,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 57,
    "symbol": "La",
    "mass_amu": 138.9,
    "compton_freq_Hz": 3.128620964645035e+25,
    "energy_eV": 129402262869.77528,
    "log10_E": 11.111941870948321,
    "d_eff": 3.544,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-early",
    "base_archetype": "HCP",
    "SO_meV": 73.6,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 58,
    "symbol": "Ce",
    "mass_amu": 140.1,
    "compton_freq_Hz": 3.1556500874497437e+25,
    "energy_eV": 130520208985.2809,
    "log10_E": 11.115677760496482,
    "d_eff": 3.5444,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-early",
    "base_archetype": "HCP",
    "SO_meV": 76.9,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 59,
    "symbol": "Pr",
    "mass_amu": 140.9,
    "compton_freq_Hz": 3.1736695026528828e+25,
    "energy_eV": 131265506395.61798,
    "log10_E": 11.118150618320064,
    "d_eff": 3.5447,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-early",
    "base_archetype": "HCP",
    "SO_meV": 80.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 60,
    "symbol": "Nd",
    "mass_amu": 144.2,
    "compton_freq_Hz": 3.247999590365831e+25,
    "energy_eV": 134339858213.25839,
    "log10_E": 11.128204885594117,
    "d_eff": 3.5457,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "HCP",
    "SO_meV": 83.7,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 61,
    "symbol": "Pm",
    "mass_amu": 145.0,
    "compton_freq_Hz": 3.26601900556897e+25,
    "energy_eV": 135085155623.59547,
    "log10_E": 11.13060762744568,
    "d_eff": 3.546,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "HCP",
    "SO_meV": 87.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 62,
    "symbol": "Sm",
    "mass_amu": 150.4,
    "compton_freq_Hz": 3.3876500581901598e+25,
    "energy_eV": 140115913143.37076,
    "log10_E": 11.14648746146633,
    "d_eff": 3.5477,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "A7",
    "SO_meV": 90.8,
    "spiral_corrected": false,
    "archetype": "A7",
    "coordination": 6,
    "stacking": "layered",
    "eigenvalue_family": "{2,3} partial",
    "eigenvalue_ratios": [
      2,
      3
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable",
      "hardness": "moderate",
      "freq_response": "semimetallic",
      "thermal_expansion": "variable",
      "nobility": "poor metal",
      "cohesive_energy": "moderate",
      "catalytic": "limited",
      "magnetism": "diamagnetic",
      "superconductor": "none-weak",
      "band_gap": "semimetal (overlap)",
      "alloy_compat": "limited",
      "resistivity": "high",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "variable",
      "e_ph_coupling": "low",
      "electronegativity": "moderate",
      "oxidation_states": "variable"
    },
    "hypothetical": false
  },
  {
    "Z": 63,
    "symbol": "Eu",
    "mass_amu": 152.0,
    "compton_freq_Hz": 3.423688888596438e+25,
    "energy_eV": 141606507964.04492,
    "log10_E": 11.151083213155479,
    "d_eff": 3.5481,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "BCC",
    "SO_meV": 94.5,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 64,
    "symbol": "Gd",
    "mass_amu": 157.3,
    "compton_freq_Hz": 3.5430675143172347e+25,
    "energy_eV": 146544103307.52808,
    "log10_E": 11.165968347833994,
    "d_eff": 3.5497,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "HCP",
    "SO_meV": 98.3,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 65,
    "symbol": "Tb",
    "mass_amu": 158.9,
    "compton_freq_Hz": 3.5791063447235133e+25,
    "energy_eV": 148034698128.20224,
    "log10_E": 11.170363522418086,
    "d_eff": 3.5502,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 102.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 66,
    "symbol": "Dy",
    "mass_amu": 162.5,
    "compton_freq_Hz": 3.6601937131376393e+25,
    "energy_eV": 151388536474.7191,
    "log10_E": 11.1800929905256,
    "d_eff": 3.5512,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 106.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 67,
    "symbol": "Ho",
    "mass_amu": 164.9,
    "compton_freq_Hz": 3.714251958747057e+25,
    "energy_eV": 153624428705.73032,
    "log10_E": 11.186460280855226,
    "d_eff": 3.5519,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 110.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 68,
    "symbol": "Er",
    "mass_amu": 167.3,
    "compton_freq_Hz": 3.7683102043564747e+25,
    "energy_eV": 155860320936.74158,
    "log10_E": 11.1927355661731,
    "d_eff": 3.5525,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 114.4,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 69,
    "symbol": "Tm",
    "mass_amu": 168.9,
    "compton_freq_Hz": 3.8043490347627525e+25,
    "energy_eV": 157350915757.4157,
    "log10_E": 11.196869274781715,
    "d_eff": 3.553,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 118.6,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 70,
    "symbol": "Yb",
    "mass_amu": 173.0,
    "compton_freq_Hz": 3.896698537678841e+25,
    "energy_eV": 161170564985.39325,
    "log10_E": 11.207285728339501,
    "d_eff": 3.5541,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "BCC",
    "SO_meV": 123.0,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 71,
    "symbol": "Lu",
    "mass_amu": 175.0,
    "compton_freq_Hz": 3.941747075686689e+25,
    "energy_eV": 163033808511.23596,
    "log10_E": 11.212277673897,
    "d_eff": 3.5546,
    "block": "f",
    "period": 6,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 127.4,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 72,
    "symbol": "Hf",
    "mass_amu": 178.5,
    "compton_freq_Hz": 4.020582017200422e+25,
    "energy_eV": 166294484681.46066,
    "log10_E": 11.220877845658919,
    "d_eff": 3.5555,
    "block": "d",
    "period": 6,
    "d_pos": 2,
    "cone_position": "plateau-start",
    "base_archetype": "HCP",
    "SO_meV": 197.9,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 73,
    "symbol": "Ta",
    "mass_amu": 180.9,
    "compton_freq_Hz": 4.074640262809839e+25,
    "energy_eV": 168530376912.4719,
    "log10_E": 11.226678192070521,
    "d_eff": 3.5561,
    "block": "d",
    "period": 6,
    "d_pos": 3,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 204.9,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 74,
    "symbol": "W",
    "mass_amu": 183.8,
    "compton_freq_Hz": 4.139960642921219e+25,
    "energy_eV": 171232080024.94382,
    "log10_E": 11.2335851322608,
    "d_eff": 3.5568,
    "block": "d",
    "period": 6,
    "d_pos": 4,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 212.0,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 75,
    "symbol": "Re",
    "mass_amu": 186.2,
    "compton_freq_Hz": 4.1940188885306365e+25,
    "energy_eV": 173467972255.95502,
    "log10_E": 11.23921930185603,
    "d_eff": 3.5574,
    "block": "d",
    "period": 6,
    "d_pos": 5,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 219.2,
    "spiral_corrected": true,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 76,
    "symbol": "Os",
    "mass_amu": 190.2,
    "compton_freq_Hz": 4.284115964546332e+25,
    "energy_eV": 177194459307.6404,
    "log10_E": 11.248450137812101,
    "d_eff": 3.5584,
    "block": "d",
    "period": 6,
    "d_pos": 6,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 226.6,
    "spiral_corrected": true,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 77,
    "symbol": "Ir",
    "mass_amu": 192.2,
    "compton_freq_Hz": 4.32916450255418e+25,
    "energy_eV": 179057702833.48312,
    "log10_E": 11.252993008543234,
    "d_eff": 3.5589,
    "block": "d",
    "period": 6,
    "d_pos": 7,
    "cone_position": "plateau-mid",
    "base_archetype": "FCC",
    "SO_meV": 234.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 78,
    "symbol": "Pt",
    "mass_amu": 195.1,
    "compton_freq_Hz": 4.39448488266556e+25,
    "energy_eV": 181759405945.95505,
    "log10_E": 11.259496894605224,
    "d_eff": 3.5596,
    "block": "d",
    "period": 6,
    "d_pos": 8,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 241.8,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 79,
    "symbol": "Au",
    "mass_amu": 197.0,
    "compton_freq_Hz": 4.437280993773015e+25,
    "energy_eV": 183529487295.5056,
    "log10_E": 11.263705851372299,
    "d_eff": 3.56,
    "block": "d",
    "period": 6,
    "d_pos": 9,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 249.6,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 80,
    "symbol": "Hg",
    "mass_amu": 200.6,
    "compton_freq_Hz": 4.518368362187141e+25,
    "energy_eV": 186883325642.02246,
    "log10_E": 11.271570553895106,
    "d_eff": 3.5608,
    "block": "d",
    "period": 6,
    "d_pos": 10,
    "cone_position": "plateau-end-late",
    "base_archetype": "HCP",
    "SO_meV": 257.6,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 81,
    "symbol": "Tl",
    "mass_amu": 204.4,
    "compton_freq_Hz": 4.603960584402052e+25,
    "energy_eV": 190423488341.1236,
    "log10_E": 11.279720516673382,
    "d_eff": 3.5617,
    "block": "p",
    "period": 6,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "HCP",
    "SO_meV": 295.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 82,
    "symbol": "Pb",
    "mass_amu": 207.2,
    "compton_freq_Hz": 4.66702853761304e+25,
    "energy_eV": 193032029277.30338,
    "log10_E": 11.285629376283902,
    "d_eff": 3.5623,
    "block": "p",
    "period": 6,
    "d_pos": 0,
    "cone_position": "slope-mid",
    "base_archetype": "FCC",
    "SO_meV": 304.4,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 83,
    "symbol": "Bi",
    "mass_amu": 209.0,
    "compton_freq_Hz": 4.7075722218201025e+25,
    "energy_eV": 194708948450.56177,
    "log10_E": 11.28938591132176,
    "d_eff": 3.5627,
    "block": "p",
    "period": 6,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "A7",
    "SO_meV": 313.8,
    "spiral_corrected": false,
    "archetype": "A7",
    "coordination": 6,
    "stacking": "layered",
    "eigenvalue_family": "{2,3} partial",
    "eigenvalue_ratios": [
      2,
      3
    ],
    "properties": {
      "conductor": "no",
      "ductility": "variable",
      "hardness": "moderate",
      "freq_response": "semimetallic",
      "thermal_expansion": "variable",
      "nobility": "poor metal",
      "cohesive_energy": "moderate",
      "catalytic": "limited",
      "magnetism": "diamagnetic",
      "superconductor": "none-weak",
      "band_gap": "semimetal (overlap)",
      "alloy_compat": "limited",
      "resistivity": "high",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "variable",
      "e_ph_coupling": "low",
      "electronegativity": "moderate",
      "oxidation_states": "variable"
    },
    "hypothetical": false
  },
  {
    "Z": 84,
    "symbol": "Po",
    "mass_amu": 209.0,
    "compton_freq_Hz": 4.7075722218201025e+25,
    "energy_eV": 194708948450.56177,
    "log10_E": 11.28938591132176,
    "d_eff": 3.5627,
    "block": "p",
    "period": 6,
    "d_pos": 0,
    "cone_position": "approach",
    "base_archetype": "other",
    "SO_meV": 323.3,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 6,
    "stacking": "simple-cubic",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 85,
    "symbol": "At",
    "mass_amu": 210.0,
    "compton_freq_Hz": 4.730096490824026e+25,
    "energy_eV": 195640570213.48312,
    "log10_E": 11.291458919944626,
    "d_eff": 3.5629,
    "block": "p",
    "period": 6,
    "d_pos": 0,
    "cone_position": "approach-near",
    "base_archetype": "other",
    "SO_meV": 333.1,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "metallic",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 86,
    "symbol": "Rn",
    "mass_amu": 222.0,
    "compton_freq_Hz": 5.000387718871113e+25,
    "energy_eV": 206820031368.5393,
    "log10_E": 11.315592599661345,
    "d_eff": 3.5655,
    "block": "p",
    "period": 6,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 342.9,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 87,
    "symbol": "Fr",
    "mass_amu": 223.0,
    "compton_freq_Hz": 5.022911987875037e+25,
    "energy_eV": 207751653131.46063,
    "log10_E": 11.317544488258868,
    "d_eff": 3.5657,
    "block": "s",
    "period": 7,
    "d_pos": 0,
    "cone_position": "peak",
    "base_archetype": "BCC",
    "SO_meV": 282.4,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 88,
    "symbol": "Ra",
    "mass_amu": 226.0,
    "compton_freq_Hz": 5.09048479488681e+25,
    "energy_eV": 210546518420.2247,
    "log10_E": 11.323348064358107,
    "d_eff": 3.5663,
    "block": "s",
    "period": 7,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "BCC",
    "SO_meV": 290.6,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 89,
    "symbol": "Ac",
    "mass_amu": 227.0,
    "compton_freq_Hz": 5.113009063890733e+25,
    "energy_eV": 211478140183.14606,
    "log10_E": 11.325265482403829,
    "d_eff": 3.5665,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-early",
    "base_archetype": "HCP",
    "SO_meV": 224.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 90,
    "symbol": "Th",
    "mass_amu": 232.0,
    "compton_freq_Hz": 5.225630408910353e+25,
    "energy_eV": 216136248997.75278,
    "log10_E": 11.334727610101606,
    "d_eff": 3.5675,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-early",
    "base_archetype": "FCC",
    "SO_meV": 230.5,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 91,
    "symbol": "Pa",
    "mass_amu": 231.0,
    "compton_freq_Hz": 5.2031061399064286e+25,
    "energy_eV": 215204627234.83145,
    "log10_E": 11.332851605102851,
    "d_eff": 3.5673,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-early",
    "base_archetype": "other",
    "SO_meV": 237.0,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "complex",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 92,
    "symbol": "U",
    "mass_amu": 238.0,
    "compton_freq_Hz": 5.360776022933897e+25,
    "energy_eV": 221725979575.28088,
    "log10_E": 11.345816582267219,
    "d_eff": 3.5687,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "other",
    "SO_meV": 243.6,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "complex",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 93,
    "symbol": "Np",
    "mass_amu": 237.0,
    "compton_freq_Hz": 5.338251753929973e+25,
    "energy_eV": 220794357812.35956,
    "log10_E": 11.34398797122081,
    "d_eff": 3.5685,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "other",
    "SO_meV": 250.2,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "complex",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 94,
    "symbol": "Pu",
    "mass_amu": 244.0,
    "compton_freq_Hz": 5.495921636957439e+25,
    "energy_eV": 227315710152.80896,
    "log10_E": 11.356629451549436,
    "d_eff": 3.5698,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "other",
    "SO_meV": 257.0,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "complex-6+",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 95,
    "symbol": "Am",
    "mass_amu": 243.0,
    "compton_freq_Hz": 5.473397367953516e+25,
    "energy_eV": 226384088389.8876,
    "log10_E": 11.35484589880902,
    "d_eff": 3.5696,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "HCP",
    "SO_meV": 263.9,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 96,
    "symbol": "Cm",
    "mass_amu": 247.0,
    "compton_freq_Hz": 5.563494443969211e+25,
    "energy_eV": 230110575441.573,
    "log10_E": 11.361936578470372,
    "d_eff": 3.5704,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-mid",
    "base_archetype": "HCP",
    "SO_meV": 270.9,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 97,
    "symbol": "Bk",
    "mass_amu": 247.0,
    "compton_freq_Hz": 5.563494443969211e+25,
    "energy_eV": 230110575441.573,
    "log10_E": 11.361936578470372,
    "d_eff": 3.5704,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 278.0,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 98,
    "symbol": "Cf",
    "mass_amu": 251.0,
    "compton_freq_Hz": 5.653591519984908e+25,
    "energy_eV": 233837062493.2584,
    "log10_E": 11.368913346691745,
    "d_eff": 3.5711,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 285.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 99,
    "symbol": "Es",
    "mass_amu": 252.0,
    "compton_freq_Hz": 5.676115788988831e+25,
    "energy_eV": 234768684256.17975,
    "log10_E": 11.370640165992251,
    "d_eff": 3.5713,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 292.6,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 100,
    "symbol": "Fm",
    "mass_amu": 257.0,
    "compton_freq_Hz": 5.788737134008452e+25,
    "energy_eV": 239426793070.7865,
    "log10_E": 11.379172748542,
    "d_eff": 3.5722,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 300.0,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 101,
    "symbol": "Md",
    "mass_amu": 258.0,
    "compton_freq_Hz": 5.811261403012375e+25,
    "energy_eV": 240358414833.70786,
    "log10_E": 11.380859331173937,
    "d_eff": 3.5724,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 307.6,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 102,
    "symbol": "No",
    "mass_amu": 259.0,
    "compton_freq_Hz": 5.8337856720162995e+25,
    "energy_eV": 241290036596.6292,
    "log10_E": 11.382539389291958,
    "d_eff": 3.5725,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 315.2,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 103,
    "symbol": "Lr",
    "mass_amu": 266.0,
    "compton_freq_Hz": 5.991455555043767e+25,
    "energy_eV": 247811388937.07864,
    "log10_E": 11.394121261841773,
    "d_eff": 3.5737,
    "block": "f",
    "period": 7,
    "d_pos": 0,
    "cone_position": "f-late",
    "base_archetype": "HCP",
    "SO_meV": 323.0,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 104,
    "symbol": "Rf",
    "mass_amu": 267.0,
    "compton_freq_Hz": 6.0139798240476905e+25,
    "energy_eV": 248743010700.0,
    "log10_E": 11.395750886575282,
    "d_eff": 3.5739,
    "block": "d",
    "period": 7,
    "d_pos": 2,
    "cone_position": "plateau-start",
    "base_archetype": "HCP",
    "SO_meV": 496.4,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 105,
    "symbol": "Db",
    "mass_amu": 268.0,
    "compton_freq_Hz": 6.036504093051615e+25,
    "energy_eV": 249674632462.92133,
    "log10_E": 11.397374419239496,
    "d_eff": 3.5741,
    "block": "d",
    "period": 7,
    "d_pos": 3,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 508.4,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 106,
    "symbol": "Sg",
    "mass_amu": 269.0,
    "compton_freq_Hz": 6.059028362055538e+25,
    "energy_eV": 250606254225.84268,
    "log10_E": 11.398991905213114,
    "d_eff": 3.5743,
    "block": "d",
    "period": 7,
    "d_pos": 4,
    "cone_position": "plateau-mid-early",
    "base_archetype": "BCC",
    "SO_meV": 520.6,
    "spiral_corrected": false,
    "archetype": "BCC",
    "coordination": 8,
    "stacking": "none",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5,
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "ductile (DBTT)",
      "hardness": "hard",
      "freq_response": "broadband",
      "thermal_expansion": "low",
      "nobility": "reactive",
      "cohesive_energy": "high",
      "catalytic": "strong-bind",
      "magnetism": "strong (if d5-d7)",
      "superconductor": "best elemental",
      "band_gap": "none",
      "alloy_compat": "BCC-only",
      "resistivity": "moderate",
      "youngs_modulus": "high",
      "lorenz_ratio": ">1 (+phonon)",
      "e_ph_coupling": "high",
      "electronegativity": "moderate",
      "oxidation_states": "high (+5 to +6)"
    },
    "hypothetical": false
  },
  {
    "Z": 107,
    "symbol": "Bh",
    "mass_amu": 270.0,
    "compton_freq_Hz": 6.0815526310594626e+25,
    "energy_eV": 251537875988.76404,
    "log10_E": 11.400603389369694,
    "d_eff": 3.5744,
    "block": "d",
    "period": 7,
    "d_pos": 5,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 532.9,
    "spiral_corrected": true,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 108,
    "symbol": "Hs",
    "mass_amu": 269.0,
    "compton_freq_Hz": 6.059028362055538e+25,
    "energy_eV": 250606254225.84268,
    "log10_E": 11.398991905213114,
    "d_eff": 3.5743,
    "block": "d",
    "period": 7,
    "d_pos": 6,
    "cone_position": "plateau-mid",
    "base_archetype": "BCC",
    "SO_meV": 545.5,
    "spiral_corrected": true,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 109,
    "symbol": "Mt",
    "mass_amu": 278.0,
    "compton_freq_Hz": 6.261746783090854e+25,
    "energy_eV": 258990850092.13483,
    "log10_E": 11.413284421128782,
    "d_eff": 3.5758,
    "block": "d",
    "period": 7,
    "d_pos": 7,
    "cone_position": "plateau-mid",
    "base_archetype": "FCC",
    "SO_meV": 558.2,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 110,
    "symbol": "Ds",
    "mass_amu": 281.0,
    "compton_freq_Hz": 6.329319590102626e+25,
    "energy_eV": 261785715380.89886,
    "log10_E": 11.417945945115786,
    "d_eff": 3.5763,
    "block": "d",
    "period": 7,
    "d_pos": 8,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 571.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 111,
    "symbol": "Rg",
    "mass_amu": 282.0,
    "compton_freq_Hz": 6.351843859106551e+25,
    "energy_eV": 262717337143.82025,
    "log10_E": 11.419488733530068,
    "d_eff": 3.5764,
    "block": "d",
    "period": 7,
    "d_pos": 9,
    "cone_position": "plateau-end",
    "base_archetype": "FCC",
    "SO_meV": 584.1,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "ductile",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "weak",
      "superconductor": "weak",
      "band_gap": "none",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 112,
    "symbol": "Cn",
    "mass_amu": 285.0,
    "compton_freq_Hz": 6.419416666118322e+25,
    "energy_eV": 265512202432.5843,
    "log10_E": 11.424084485219216,
    "d_eff": 3.5769,
    "block": "d",
    "period": 7,
    "d_pos": 10,
    "cone_position": "plateau-end-late",
    "base_archetype": "HCP",
    "SO_meV": 597.4,
    "spiral_corrected": false,
    "archetype": "HCP",
    "coordination": 12,
    "stacking": "ABAB",
    "eigenvalue_family": "{2,3}",
    "eigenvalue_ratios": [
      2,
      3,
      1.5
    ],
    "properties": {
      "conductor": "yes",
      "ductility": "variable (c/a dependent)",
      "hardness": "variable",
      "freq_response": "mixed-band",
      "thermal_expansion": "moderate",
      "nobility": "variable",
      "cohesive_energy": "high",
      "catalytic": "moderate/selective",
      "magnetism": "moderate",
      "superconductor": "moderate",
      "band_gap": "none",
      "alloy_compat": "limited",
      "resistivity": "highest-metal",
      "youngs_modulus": "moderate-high",
      "lorenz_ratio": "~1 (mixed)",
      "e_ph_coupling": "moderate",
      "electronegativity": "low-moderate",
      "oxidation_states": "extreme (up to +8)"
    },
    "hypothetical": false
  },
  {
    "Z": 113,
    "symbol": "Nh",
    "mass_amu": 286.0,
    "compton_freq_Hz": 6.441940935122246e+25,
    "energy_eV": 266443824195.5056,
    "log10_E": 11.42560565833975,
    "d_eff": 3.5771,
    "block": "p",
    "period": 7,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 678.7,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown-p",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 114,
    "symbol": "Fl",
    "mass_amu": 289.0,
    "compton_freq_Hz": 6.5095137421340165e+25,
    "energy_eV": 269238689484.26962,
    "log10_E": 11.430137467967254,
    "d_eff": 3.5775,
    "block": "p",
    "period": 7,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 693.8,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown-p",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 115,
    "symbol": "Mc",
    "mass_amu": 290.0,
    "compton_freq_Hz": 6.53203801113794e+25,
    "energy_eV": 270170311247.19095,
    "log10_E": 11.431637623109662,
    "d_eff": 3.5777,
    "block": "p",
    "period": 7,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 709.1,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown-p",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 116,
    "symbol": "Lv",
    "mass_amu": 293.0,
    "compton_freq_Hz": 6.599610818149713e+25,
    "energy_eV": 272965176535.95502,
    "log10_E": 11.436107245564816,
    "d_eff": 3.5782,
    "block": "p",
    "period": 7,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 724.6,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown-p",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 117,
    "symbol": "Ts",
    "mass_amu": 294.0,
    "compton_freq_Hz": 6.622135087153636e+25,
    "energy_eV": 273896798298.87637,
    "log10_E": 11.437586955622864,
    "d_eff": 3.5783,
    "block": "p",
    "period": 7,
    "d_pos": 0,
    "cone_position": "slope",
    "base_archetype": "other",
    "SO_meV": 740.3,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown-p",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": false
  },
  {
    "Z": 118,
    "symbol": "Og",
    "mass_amu": 294.0,
    "compton_freq_Hz": 6.622135087153636e+25,
    "energy_eV": 273896798298.87637,
    "log10_E": 11.437586955622864,
    "d_eff": 3.5783,
    "block": "p",
    "period": 7,
    "d_pos": 0,
    "cone_position": "node",
    "base_archetype": "FCC",
    "SO_meV": 756.3,
    "spiral_corrected": false,
    "archetype": "FCC",
    "coordination": 12,
    "stacking": "ABCABC",
    "eigenvalue_family": "{2,3} mixed",
    "eigenvalue_ratios": [
      1.3333333333333333
    ],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (noble gas)",
      "hardness": "soft",
      "freq_response": "selective/plasmonic",
      "thermal_expansion": "high",
      "nobility": "noble",
      "cohesive_energy": "low-moderate",
      "catalytic": "selective",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (large)",
      "alloy_compat": "FCC-only",
      "resistivity": "low",
      "youngs_modulus": "moderate",
      "lorenz_ratio": "<1 (electronic)",
      "e_ph_coupling": "low",
      "electronegativity": "high",
      "oxidation_states": "low (+1 to +4)"
    },
    "hypothetical": false
  },
  {
    "Z": 119,
    "symbol": "E119",
    "mass_amu": 315.0,
    "compton_freq_Hz": 7.095144736236039e+25,
    "energy_eV": 293460855320.2247,
    "log10_E": 11.467550179000307,
    "d_eff": 3.5815,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 617.9,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 120,
    "symbol": "E120",
    "mass_amu": 320.0,
    "compton_freq_Hz": 7.20776608125566e+25,
    "energy_eV": 298118964134.8314,
    "log10_E": 11.474389603530613,
    "d_eff": 3.5822,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 631.0,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 121,
    "symbol": "E121",
    "mass_amu": 325.0,
    "compton_freq_Hz": 7.3203874262752785e+25,
    "energy_eV": 302777072949.4382,
    "log10_E": 11.48112298618958,
    "d_eff": 3.5829,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 644.2,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 122,
    "symbol": "E122",
    "mass_amu": 330.0,
    "compton_freq_Hz": 7.433008771294898e+25,
    "energy_eV": 307435181764.0449,
    "log10_E": 11.487753565088594,
    "d_eff": 3.5836,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 657.6,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 123,
    "symbol": "E123",
    "mass_amu": 335.0,
    "compton_freq_Hz": 7.545630116314518e+25,
    "energy_eV": 312093290578.6517,
    "log10_E": 11.494284432247552,
    "d_eff": 3.5843,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 671.2,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 124,
    "symbol": "E124",
    "mass_amu": 340.0,
    "compton_freq_Hz": 7.658251461334138e+25,
    "energy_eV": 316751399393.2584,
    "log10_E": 11.500718542252962,
    "d_eff": 3.585,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 684.9,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 125,
    "symbol": "E125",
    "mass_amu": 345.0,
    "compton_freq_Hz": 7.770872806353758e+25,
    "energy_eV": 321409508207.8652,
    "log10_E": 11.50705872028398,
    "d_eff": 3.5856,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 698.8,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  },
  {
    "Z": 126,
    "symbol": "E126",
    "mass_amu": 350.0,
    "compton_freq_Hz": 7.883494151373378e+25,
    "energy_eV": 326067617022.4719,
    "log10_E": 11.513307669560982,
    "d_eff": 3.5863,
    "block": "g?",
    "period": 8,
    "d_pos": 0,
    "cone_position": "unknown",
    "base_archetype": "other",
    "SO_meV": 712.8,
    "spiral_corrected": false,
    "archetype": "other",
    "coordination": 0,
    "stacking": "unknown",
    "eigenvalue_family": "N/A",
    "eigenvalue_ratios": [],
    "properties": {
      "conductor": "no",
      "ductility": "N/A (not metallic)",
      "hardness": "N/A",
      "freq_response": "molecular",
      "thermal_expansion": "high (molecular)",
      "nobility": "N/A",
      "cohesive_energy": "low (vdW or molecular)",
      "catalytic": "N/A",
      "magnetism": "diamagnetic",
      "superconductor": "none",
      "band_gap": "yes (molecular)",
      "alloy_compat": "none",
      "resistivity": "insulator",
      "youngs_modulus": "low",
      "lorenz_ratio": "N/A",
      "e_ph_coupling": "N/A",
      "electronegativity": "varies",
      "oxidation_states": "varies"
    },
    "hypothetical": true
  }
]