List of Periodic Table of Elements (Summary)

List of all elements in the periodic table along with a summary of each element. Available in an API, JSON and CSV formats. The data is available as a CSV file or JSON file download, or by accessing our dedicated API endpoint directly.

Data Formats: json | csv | table | api
[
    {
      "name": "Hydrogen",
      "atomic_mass": 1.008,
      "category": "diatomic nonmetal",
      "density": 0.08988,
      "melt": 13.99,
      "molar_heat": 28.836,
      "number": 1,
      "period": 1,
      "phase": "Gas",
      "symbol": "H",
      "xpos": 1,
      "ypos": 1,
      "shells": [
        1
      ]
    },
    {
      "name": "Helium",
      "atomic_mass": 4.0026022,
      "category": "noble gas",
      "density": 0.1786,
      "melt": 0.95,
      "molar_heat": null,
      "number": 2,
      "period": 1,
      "phase": "Gas",
      "symbol": "He",
      "xpos": 18,
      "ypos": 1,
      "shells": [
        2
      ]
    },
    {
      "name": "Lithium",
      "atomic_mass": 6.94,
      "category": "alkali metal",
      "density": 0.534,
      "melt": 453.65,
      "molar_heat": 24.86,
      "number": 3,
      "period": 2,
      "phase": "Solid",
      "symbol": "Li",
      "xpos": 1,
      "ypos": 2,
      "shells": [
        2,
        1
      ]
    },
    {
      "name": "Beryllium",
      "atomic_mass": 9.01218315,
      "category": "alkaline earth metal",
      "density": 1.85,
      "melt": 1560,
      "molar_heat": 16.443,
      "number": 4,
      "period": 2,
      "phase": "Solid",
      "symbol": "Be",
      "xpos": 2,
      "ypos": 2,
      "shells": [
        2,
        2
      ]
    },
    {
      "name": "Boron",
      "atomic_mass": 10.81,
      "category": "metalloid",
      "density": 2.08,
      "melt": 2349,
      "molar_heat": 11.087,
      "number": 5,
      "period": 2,
      "phase": "Solid",
      "symbol": "B",
      "xpos": 13,
      "ypos": 2,
      "shells": [
        2,
        3
      ]
    },
    {
      "name": "Carbon",
      "atomic_mass": 12.011,
      "category": "polyatomic nonmetal",
      "density": 1.821,
      "melt": null,
      "molar_heat": 8.517,
      "number": 6,
      "period": 2,
      "phase": "Solid",
      "symbol": "C",
      "xpos": 14,
      "ypos": 2,
      "shells": [
        2,
        4
      ]
    },
    {
      "name": "Nitrogen",
      "atomic_mass": 14.007,
      "category": "diatomic nonmetal",
      "density": 1.251,
      "melt": 63.15,
      "molar_heat": null,
      "number": 7,
      "period": 2,
      "phase": "Gas",
      "symbol": "N",
      "xpos": 15,
      "ypos": 2,
      "shells": [
        2,
        5
      ]
    },
    {
      "name": "Oxygen",
      "atomic_mass": 15.999,
      "category": "diatomic nonmetal",
      "density": 1.429,
      "melt": 54.36,
      "molar_heat": null,
      "number": 8,
      "period": 2,
      "phase": "Gas",
      "symbol": "O",
      "xpos": 16,
      "ypos": 2,
      "shells": [
        2,
        6
      ]
    },
    {
      "name": "Fluorine",
      "atomic_mass": 18.9984031636,
      "category": "diatomic nonmetal",
      "density": 1.696,
      "melt": 53.48,
      "molar_heat": null,
      "number": 9,
      "period": 2,
      "phase": "Gas",
      "symbol": "F",
      "xpos": 17,
      "ypos": 2,
      "shells": [
        2,
        7
      ]
    },
    {
      "name": "Neon",
      "atomic_mass": 20.17976,
      "category": "noble gas",
      "density": 0.9002,
      "melt": 24.56,
      "molar_heat": null,
      "number": 10,
      "period": 2,
      "phase": "Gas",
      "symbol": "Ne",
      "xpos": 18,
      "ypos": 2,
      "shells": [
        2,
        8
      ]
    },
    {
      "name": "Sodium",
      "atomic_mass": 22.989769282,
      "category": "alkali metal",
      "density": 0.968,
      "melt": 370.944,
      "molar_heat": 28.23,
      "number": 11,
      "period": 3,
      "phase": "Solid",
      "symbol": "Na",
      "xpos": 1,
      "ypos": 3,
      "shells": [
        2,
        8,
        1
      ]
    },
    {
      "name": "Magnesium",
      "atomic_mass": 24.305,
      "category": "alkaline earth metal",
      "density": 1.738,
      "melt": 923,
      "molar_heat": 24.869,
      "number": 12,
      "period": 3,
      "phase": "Solid",
      "symbol": "Mg",
      "xpos": 2,
      "ypos": 3,
      "shells": [
        2,
        8,
        2
      ]
    },
    {
      "name": "Aluminium",
      "atomic_mass": 26.98153857,
      "category": "post-transition metal",
      "density": 2.7,
      "melt": 933.47,
      "molar_heat": 24.2,
      "number": 13,
      "period": 3,
      "phase": "Solid",
      "symbol": "Al",
      "xpos": 13,
      "ypos": 3,
      "shells": [
        2,
        8,
        3
      ]
    },
    {
      "name": "Silicon",
      "atomic_mass": 28.085,
      "category": "metalloid",
      "density": 2.329,
      "melt": 1687,
      "molar_heat": 19.789,
      "number": 14,
      "period": 3,
      "phase": "Solid",
      "symbol": "Si",
      "xpos": 14,
      "ypos": 3,
      "shells": [
        2,
        8,
        4
      ]
    },
    {
      "name": "Phosphorus",
      "atomic_mass": 30.9737619985,
      "category": "polyatomic nonmetal",
      "density": 1.823,
      "melt": null,
      "molar_heat": 23.824,
      "number": 15,
      "period": 3,
      "phase": "Solid",
      "symbol": "P",
      "xpos": 15,
      "ypos": 3,
      "shells": [
        2,
        8,
        5
      ]
    },
    {
      "name": "Sulfur",
      "atomic_mass": 32.06,
      "category": "polyatomic nonmetal",
      "density": 2.07,
      "melt": 388.36,
      "molar_heat": 22.75,
      "number": 16,
      "period": 3,
      "phase": "Solid",
      "symbol": "S",
      "xpos": 16,
      "ypos": 3,
      "shells": [
        2,
        8,
        6
      ]
    },
    {
      "name": "Chlorine",
      "atomic_mass": 35.45,
      "category": "diatomic nonmetal",
      "density": 3.2,
      "melt": 171.6,
      "molar_heat": null,
      "number": 17,
      "period": 3,
      "phase": "Gas",
      "symbol": "Cl",
      "xpos": 17,
      "ypos": 3,
      "shells": [
        2,
        8,
        7
      ]
    },
    {
      "name": "Argon",
      "atomic_mass": 39.9481,
      "category": "noble gas",
      "density": 1.784,
      "melt": 83.81,
      "molar_heat": null,
      "number": 18,
      "period": 3,
      "phase": "Gas",
      "symbol": "Ar",
      "xpos": 18,
      "ypos": 3,
      "shells": [
        2,
        8,
        8
      ]
    },
    {
      "name": "Potassium",
      "atomic_mass": 39.09831,
      "category": "alkali metal",
      "density": 0.862,
      "melt": 336.7,
      "molar_heat": 29.6,
      "number": 19,
      "period": 4,
      "phase": "Solid",
      "symbol": "K",
      "xpos": 1,
      "ypos": 4,
      "shells": [
        2,
        8,
        8,
        1
      ]
    },
    {
      "name": "Calcium",
      "atomic_mass": 40.0784,
      "category": "alkaline earth metal",
      "density": 1.55,
      "melt": 1115,
      "molar_heat": 25.929,
      "number": 20,
      "period": 4,
      "phase": "Solid",
      "symbol": "Ca",
      "xpos": 2,
      "ypos": 4,
      "shells": [
        2,
        8,
        8,
        2
      ]
    },
    {
      "name": "Scandium",
      "atomic_mass": 44.9559085,
      "category": "transition metal",
      "density": 2.985,
      "melt": 1814,
      "molar_heat": 25.52,
      "number": 21,
      "period": 4,
      "phase": "Solid",
      "symbol": "Sc",
      "xpos": 3,
      "ypos": 4,
      "shells": [
        2,
        8,
        9,
        2
      ]
    },
    {
      "name": "Titanium",
      "atomic_mass": 47.8671,
      "category": "transition metal",
      "density": 4.506,
      "melt": 1941,
      "molar_heat": 25.06,
      "number": 22,
      "period": 4,
      "phase": "Solid",
      "symbol": "Ti",
      "xpos": 4,
      "ypos": 4,
      "shells": [
        2,
        8,
        10,
        2
      ]
    },
    {
      "name": "Vanadium",
      "atomic_mass": 50.94151,
      "category": "transition metal",
      "density": 6,
      "melt": 2183,
      "molar_heat": 24.89,
      "number": 23,
      "period": 4,
      "phase": "Solid",
      "symbol": "V",
      "xpos": 5,
      "ypos": 4,
      "shells": [
        2,
        8,
        11,
        2
      ]
    },
    {
      "name": "Chromium",
      "atomic_mass": 51.99616,
      "category": "transition metal",
      "density": 7.19,
      "melt": 2180,
      "molar_heat": 23.35,
      "number": 24,
      "period": 4,
      "phase": "Solid",
      "symbol": "Cr",
      "xpos": 6,
      "ypos": 4,
      "shells": [
        2,
        8,
        13,
        1
      ]
    },
    {
      "name": "Manganese",
      "atomic_mass": 54.9380443,
      "category": "transition metal",
      "density": 7.21,
      "melt": 1519,
      "molar_heat": 26.32,
      "number": 25,
      "period": 4,
      "phase": "Solid",
      "symbol": "Mn",
      "xpos": 7,
      "ypos": 4,
      "shells": [
        2,
        8,
        13,
        2
      ]
    },
    {
      "name": "Iron",
      "atomic_mass": 55.8452,
      "category": "transition metal",
      "density": 7.874,
      "melt": 1811,
      "molar_heat": 25.1,
      "number": 26,
      "period": 4,
      "phase": "Solid",
      "symbol": "Fe",
      "xpos": 8,
      "ypos": 4,
      "shells": [
        2,
        8,
        14,
        2
      ]
    },
    {
      "name": "Cobalt",
      "atomic_mass": 58.9331944,
      "category": "transition metal",
      "density": 8.9,
      "melt": 1768,
      "molar_heat": 24.81,
      "number": 27,
      "period": 4,
      "phase": "Solid",
      "symbol": "Co",
      "xpos": 9,
      "ypos": 4,
      "shells": [
        2,
        8,
        15,
        2
      ]
    },
    {
      "name": "Nickel",
      "atomic_mass": 58.69344,
      "category": "transition metal",
      "density": 8.908,
      "melt": 1728,
      "molar_heat": 26.07,
      "number": 28,
      "period": 4,
      "phase": "Solid",
      "symbol": "Ni",
      "xpos": 10,
      "ypos": 4,
      "shells": [
        2,
        8,
        16,
        2
      ]
    },
    {
      "name": "Copper",
      "atomic_mass": 63.5463,
      "category": "transition metal",
      "density": 8.96,
      "melt": 1357.77,
      "molar_heat": 24.44,
      "number": 29,
      "period": 4,
      "phase": "Solid",
      "symbol": "Cu",
      "xpos": 11,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        1
      ]
    },
    {
      "name": "Zinc",
      "atomic_mass": 65.382,
      "category": "transition metal",
      "density": 7.14,
      "melt": 692.68,
      "molar_heat": 25.47,
      "number": 30,
      "period": 4,
      "phase": "Solid",
      "symbol": "Zn",
      "xpos": 12,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        2
      ]
    },
    {
      "name": "Gallium",
      "atomic_mass": 69.7231,
      "category": "post-transition metal",
      "density": 5.91,
      "melt": 302.9146,
      "molar_heat": 25.86,
      "number": 31,
      "period": 4,
      "phase": "Solid",
      "symbol": "Ga",
      "xpos": 13,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        3
      ]
    },
    {
      "name": "Germanium",
      "atomic_mass": 72.6308,
      "category": "metalloid",
      "density": 5.323,
      "melt": 1211.4,
      "molar_heat": 23.222,
      "number": 32,
      "period": 4,
      "phase": "Solid",
      "symbol": "Ge",
      "xpos": 14,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        4
      ]
    },
    {
      "name": "Arsenic",
      "atomic_mass": 74.9215956,
      "category": "metalloid",
      "density": 5.727,
      "melt": null,
      "molar_heat": 24.64,
      "number": 33,
      "period": 4,
      "phase": "Solid",
      "symbol": "As",
      "xpos": 15,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        5
      ]
    },
    {
      "name": "Selenium",
      "atomic_mass": 78.9718,
      "category": "polyatomic nonmetal",
      "density": 4.81,
      "melt": 494,
      "molar_heat": 25.363,
      "number": 34,
      "period": 4,
      "phase": "Solid",
      "symbol": "Se",
      "xpos": 16,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        6
      ]
    },
    {
      "name": "Bromine",
      "atomic_mass": 79.904,
      "category": "diatomic nonmetal",
      "density": 3.1028,
      "melt": 265.8,
      "molar_heat": null,
      "number": 35,
      "period": 4,
      "phase": "Liquid",
      "symbol": "Br",
      "xpos": 17,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        7
      ]
    },
    {
      "name": "Krypton",
      "atomic_mass": 83.7982,
      "category": "noble gas",
      "density": 3.749,
      "melt": 115.78,
      "molar_heat": null,
      "number": 36,
      "period": 4,
      "phase": "Gas",
      "symbol": "Kr",
      "xpos": 18,
      "ypos": 4,
      "shells": [
        2,
        8,
        18,
        8
      ]
    },
    {
      "name": "Rubidium",
      "atomic_mass": 85.46783,
      "category": "alkali metal",
      "density": 1.532,
      "melt": 312.45,
      "molar_heat": 31.06,
      "number": 37,
      "period": 5,
      "phase": "Solid",
      "symbol": "Rb",
      "xpos": 1,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        8,
        1
      ]
    },
    {
      "name": "Strontium",
      "atomic_mass": 87.621,
      "category": "alkaline earth metal",
      "density": 2.64,
      "melt": 1050,
      "molar_heat": 26.4,
      "number": 38,
      "period": 5,
      "phase": "Solid",
      "symbol": "Sr",
      "xpos": 2,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        8,
        2
      ]
    },
    {
      "name": "Yttrium",
      "atomic_mass": 88.905842,
      "category": "transition metal",
      "density": 4.472,
      "melt": 1799,
      "molar_heat": 26.53,
      "number": 39,
      "period": 5,
      "phase": "Solid",
      "symbol": "Y",
      "xpos": 3,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        9,
        2
      ]
    },
    {
      "name": "Zirconium",
      "atomic_mass": 91.2242,
      "category": "transition metal",
      "density": 6.52,
      "melt": 2128,
      "molar_heat": 25.36,
      "number": 40,
      "period": 5,
      "phase": "Solid",
      "symbol": "Zr",
      "xpos": 4,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        10,
        2
      ]
    },
    {
      "name": "Niobium",
      "atomic_mass": 92.906372,
      "category": "transition metal",
      "density": 8.57,
      "melt": 2750,
      "molar_heat": 24.6,
      "number": 41,
      "period": 5,
      "phase": "Solid",
      "symbol": "Nb",
      "xpos": 5,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        12,
        1
      ]
    },
    {
      "name": "Molybdenum",
      "atomic_mass": 95.951,
      "category": "transition metal",
      "density": 10.28,
      "melt": 2896,
      "molar_heat": 24.06,
      "number": 42,
      "period": 5,
      "phase": "Solid",
      "symbol": "Mo",
      "xpos": 6,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        13,
        1
      ]
    },
    {
      "name": "Technetium",
      "atomic_mass": 98,
      "category": "transition metal",
      "density": 11,
      "melt": 2430,
      "molar_heat": 24.27,
      "number": 43,
      "period": 5,
      "phase": "Solid",
      "symbol": "Tc",
      "xpos": 7,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        13,
        2
      ]
    },
    {
      "name": "Ruthenium",
      "atomic_mass": 101.072,
      "category": "transition metal",
      "density": 12.45,
      "melt": 2607,
      "molar_heat": 24.06,
      "number": 44,
      "period": 5,
      "phase": "Solid",
      "symbol": "Ru",
      "xpos": 8,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        15,
        1
      ]
    },
    {
      "name": "Rhodium",
      "atomic_mass": 102.905502,
      "category": "transition metal",
      "density": 12.41,
      "melt": 2237,
      "molar_heat": 24.98,
      "number": 45,
      "period": 5,
      "phase": "Solid",
      "symbol": "Rh",
      "xpos": 9,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        16,
        1
      ]
    },
    {
      "name": "Palladium",
      "atomic_mass": 106.421,
      "category": "transition metal",
      "density": 12.023,
      "melt": 1828.05,
      "molar_heat": 25.98,
      "number": 46,
      "period": 5,
      "phase": "Solid",
      "symbol": "Pd",
      "xpos": 10,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18
      ]
    },
    {
      "name": "Silver",
      "atomic_mass": 107.86822,
      "category": "transition metal",
      "density": 10.49,
      "melt": 1234.93,
      "molar_heat": 25.35,
      "number": 47,
      "period": 5,
      "phase": "Solid",
      "symbol": "Ag",
      "xpos": 11,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        1
      ]
    },
    {
      "name": "Cadmium",
      "atomic_mass": 112.4144,
      "category": "transition metal",
      "density": 8.65,
      "melt": 594.22,
      "molar_heat": 26.02,
      "number": 48,
      "period": 5,
      "phase": "Solid",
      "symbol": "Cd",
      "xpos": 12,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        2
      ]
    },
    {
      "name": "Indium",
      "atomic_mass": 114.8181,
      "category": "post-transition metal",
      "density": 7.31,
      "melt": 429.7485,
      "molar_heat": 26.74,
      "number": 49,
      "period": 5,
      "phase": "Solid",
      "symbol": "In",
      "xpos": 13,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        3
      ]
    },
    {
      "name": "Tin",
      "atomic_mass": 118.7107,
      "category": "post-transition metal",
      "density": 7.365,
      "melt": 505.08,
      "molar_heat": 27.112,
      "number": 50,
      "period": 5,
      "phase": "Solid",
      "symbol": "Sn",
      "xpos": 14,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        4
      ]
    },
    {
      "name": "Antimony",
      "atomic_mass": 121.7601,
      "category": "metalloid",
      "density": 6.697,
      "melt": 903.78,
      "molar_heat": 25.23,
      "number": 51,
      "period": 5,
      "phase": "Solid",
      "symbol": "Sb",
      "xpos": 15,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        5
      ]
    },
    {
      "name": "Tellurium",
      "atomic_mass": 127.603,
      "category": "metalloid",
      "density": 6.24,
      "melt": 722.66,
      "molar_heat": 25.73,
      "number": 52,
      "period": 5,
      "phase": "Solid",
      "symbol": "Te",
      "xpos": 16,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        6
      ]
    },
    {
      "name": "Iodine",
      "atomic_mass": 126.904473,
      "category": "diatomic nonmetal",
      "density": 4.933,
      "melt": 386.85,
      "molar_heat": null,
      "number": 53,
      "period": 5,
      "phase": "Solid",
      "symbol": "I",
      "xpos": 17,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        7
      ]
    },
    {
      "name": "Xenon",
      "atomic_mass": 131.2936,
      "category": "noble gas",
      "density": 5.894,
      "melt": 161.4,
      "molar_heat": null,
      "number": 54,
      "period": 5,
      "phase": "Gas",
      "symbol": "Xe",
      "xpos": 18,
      "ypos": 5,
      "shells": [
        2,
        8,
        18,
        18,
        8
      ]
    },
    {
      "name": "Cesium",
      "atomic_mass": 132.905451966,
      "category": "alkali metal",
      "density": 1.93,
      "melt": 301.7,
      "molar_heat": 32.21,
      "number": 55,
      "period": 6,
      "phase": "Solid",
      "symbol": "Cs",
      "xpos": 1,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        18,
        8,
        1
      ]
    },
    {
      "name": "Barium",
      "atomic_mass": 137.3277,
      "category": "alkaline earth metal",
      "density": 3.51,
      "melt": 1000,
      "molar_heat": 28.07,
      "number": 56,
      "period": 6,
      "phase": "Solid",
      "symbol": "Ba",
      "xpos": 2,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        18,
        8,
        2
      ]
    },
    {
      "name": "Lanthanum",
      "atomic_mass": 138.905477,
      "category": "lanthanide",
      "density": 6.162,
      "melt": 1193,
      "molar_heat": 27.11,
      "number": 57,
      "period": 6,
      "phase": "Solid",
      "symbol": "La",
      "xpos": 3,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        18,
        9,
        2
      ]
    },
    {
      "name": "Cerium",
      "atomic_mass": 140.1161,
      "category": "lanthanide",
      "density": 6.77,
      "melt": 1068,
      "molar_heat": 26.94,
      "number": 58,
      "period": 6,
      "phase": "Solid",
      "symbol": "Ce",
      "xpos": 4,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        19,
        9,
        2
      ]
    },
    {
      "name": "Praseodymium",
      "atomic_mass": 140.907662,
      "category": "lanthanide",
      "density": 6.77,
      "melt": 1208,
      "molar_heat": 27.2,
      "number": 59,
      "period": 6,
      "phase": "Solid",
      "symbol": "Pr",
      "xpos": 5,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        21,
        8,
        2
      ]
    },
    {
      "name": "Neodymium",
      "atomic_mass": 144.2423,
      "category": "lanthanide",
      "density": 7.01,
      "melt": 1297,
      "molar_heat": 27.45,
      "number": 60,
      "period": 6,
      "phase": "Solid",
      "symbol": "Nd",
      "xpos": 6,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        22,
        8,
        2
      ]
    },
    {
      "name": "Promethium",
      "atomic_mass": 145,
      "category": "lanthanide",
      "density": 7.26,
      "melt": 1315,
      "molar_heat": null,
      "number": 61,
      "period": 6,
      "phase": "Solid",
      "symbol": "Pm",
      "xpos": 7,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        23,
        8,
        2
      ]
    },
    {
      "name": "Samarium",
      "atomic_mass": 150.362,
      "category": "lanthanide",
      "density": 7.52,
      "melt": 1345,
      "molar_heat": 29.54,
      "number": 62,
      "period": 6,
      "phase": "Solid",
      "symbol": "Sm",
      "xpos": 8,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        24,
        8,
        2
      ]
    },
    {
      "name": "Europium",
      "atomic_mass": 151.9641,
      "category": "lanthanide",
      "density": 5.264,
      "melt": 1099,
      "molar_heat": 27.66,
      "number": 63,
      "period": 6,
      "phase": "Solid",
      "symbol": "Eu",
      "xpos": 9,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        25,
        8,
        2
      ]
    },
    {
      "name": "Gadolinium",
      "atomic_mass": 157.253,
      "category": "lanthanide",
      "density": 7.9,
      "melt": 1585,
      "molar_heat": 37.03,
      "number": 64,
      "period": 6,
      "phase": "Solid",
      "symbol": "Gd",
      "xpos": 10,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        25,
        9,
        2
      ]
    },
    {
      "name": "Terbium",
      "atomic_mass": 158.925352,
      "category": "lanthanide",
      "density": 8.23,
      "melt": 1629,
      "molar_heat": 28.91,
      "number": 65,
      "period": 6,
      "phase": "Solid",
      "symbol": "Tb",
      "xpos": 11,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        27,
        8,
        2
      ]
    },
    {
      "name": "Dysprosium",
      "atomic_mass": 162.5001,
      "category": "lanthanide",
      "density": 8.54,
      "melt": 1680,
      "molar_heat": 27.7,
      "number": 66,
      "period": 6,
      "phase": "Solid",
      "symbol": "Dy",
      "xpos": 12,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        28,
        8,
        2
      ]
    },
    {
      "name": "Holmium",
      "atomic_mass": 164.930332,
      "category": "lanthanide",
      "density": 8.79,
      "melt": 1734,
      "molar_heat": 27.15,
      "number": 67,
      "period": 6,
      "phase": "Solid",
      "symbol": "Ho",
      "xpos": 13,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        29,
        8,
        2
      ]
    },
    {
      "name": "Erbium",
      "atomic_mass": 167.2593,
      "category": "lanthanide",
      "density": 9.066,
      "melt": 1802,
      "molar_heat": 28.12,
      "number": 68,
      "period": 6,
      "phase": "Solid",
      "symbol": "Er",
      "xpos": 14,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        30,
        8,
        2
      ]
    },
    {
      "name": "Thulium",
      "atomic_mass": 168.934222,
      "category": "lanthanide",
      "density": 9.32,
      "melt": 1818,
      "molar_heat": 27.03,
      "number": 69,
      "period": 6,
      "phase": "Solid",
      "symbol": "Tm",
      "xpos": 15,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        31,
        8,
        2
      ]
    },
    {
      "name": "Ytterbium",
      "atomic_mass": 173.0451,
      "category": "lanthanide",
      "density": 6.9,
      "melt": 1097,
      "molar_heat": 26.74,
      "number": 70,
      "period": 6,
      "phase": "Solid",
      "symbol": "Yb",
      "xpos": 16,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        32,
        8,
        2
      ]
    },
    {
      "name": "Lutetium",
      "atomic_mass": 174.96681,
      "category": "lanthanide",
      "density": 9.841,
      "melt": 1925,
      "molar_heat": 26.86,
      "number": 71,
      "period": 6,
      "phase": "Solid",
      "symbol": "Lu",
      "xpos": 17,
      "ypos": 9,
      "shells": [
        2,
        8,
        18,
        32,
        9,
        2
      ]
    },
    {
      "name": "Hafnium",
      "atomic_mass": 178.492,
      "category": "transition metal",
      "density": 13.31,
      "melt": 2506,
      "molar_heat": 25.73,
      "number": 72,
      "period": 6,
      "phase": "Solid",
      "symbol": "Hf",
      "xpos": 4,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        10,
        2
      ]
    },
    {
      "name": "Tantalum",
      "atomic_mass": 180.947882,
      "category": "transition metal",
      "density": 16.69,
      "melt": 3290,
      "molar_heat": 25.36,
      "number": 73,
      "period": 6,
      "phase": "Solid",
      "symbol": "Ta",
      "xpos": 5,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        11,
        2
      ]
    },
    {
      "name": "Tungsten",
      "atomic_mass": 183.841,
      "category": "transition metal",
      "density": 19.25,
      "melt": 3695,
      "molar_heat": 24.27,
      "number": 74,
      "period": 6,
      "phase": "Solid",
      "symbol": "W",
      "xpos": 6,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        12,
        2
      ]
    },
    {
      "name": "Rhenium",
      "atomic_mass": 186.2071,
      "category": "transition metal",
      "density": 21.02,
      "melt": 3459,
      "molar_heat": 25.48,
      "number": 75,
      "period": 6,
      "phase": "Solid",
      "symbol": "Re",
      "xpos": 7,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        13,
        2
      ]
    },
    {
      "name": "Osmium",
      "atomic_mass": 190.233,
      "category": "transition metal",
      "density": 22.59,
      "melt": 3306,
      "molar_heat": 24.7,
      "number": 76,
      "period": 6,
      "phase": "Solid",
      "symbol": "Os",
      "xpos": 8,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        14,
        2
      ]
    },
    {
      "name": "Iridium",
      "atomic_mass": 192.2173,
      "category": "transition metal",
      "density": 22.56,
      "melt": 2719,
      "molar_heat": 25.1,
      "number": 77,
      "period": 6,
      "phase": "Solid",
      "symbol": "Ir",
      "xpos": 9,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        15,
        2
      ]
    },
    {
      "name": "Platinum",
      "atomic_mass": 195.0849,
      "category": "transition metal",
      "density": 21.45,
      "melt": 2041.4,
      "molar_heat": 25.86,
      "number": 78,
      "period": 6,
      "phase": "Solid",
      "symbol": "Pt",
      "xpos": 10,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        17,
        1
      ]
    },
    {
      "name": "Gold",
      "atomic_mass": 196.9665695,
      "category": "transition metal",
      "density": 19.3,
      "melt": 1337.33,
      "molar_heat": 25.418,
      "number": 79,
      "period": 6,
      "phase": "Solid",
      "symbol": "Au",
      "xpos": 11,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        18,
        1
      ]
    },
    {
      "name": "Mercury",
      "atomic_mass": 200.5923,
      "category": "transition metal",
      "density": 13.534,
      "melt": 234.321,
      "molar_heat": 27.983,
      "number": 80,
      "period": 6,
      "phase": "Liquid",
      "symbol": "Hg",
      "xpos": 12,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        18,
        2
      ]
    },
    {
      "name": "Thallium",
      "atomic_mass": 204.38,
      "category": "post-transition metal",
      "density": 11.85,
      "melt": 577,
      "molar_heat": 26.32,
      "number": 81,
      "period": 6,
      "phase": "Solid",
      "symbol": "Tl",
      "xpos": 13,
      "ypos": 6,
      "shells": [
        2,
        8,
        18,
        32,
        18,
        3
      ]
    },
    {
      "name": "Lead",
      "atomic_mass": 207.21,
      "category": "post-transition metal",
      "density": 11.34,
      "melt": 600.61,
      "molar_heat": 26.65,
      "number": 82,
      "period": 6,
      "phase": "Solid",
      "symbol": "Pb",
      "xpos": 14,
      "ypos": 6,
      "shells": [
        2,
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