Key chemical elements with atomic number, symbol, category, atomic mass, period, and group. Free to use, no attribution required — copy it, download it, or open it directly in the JSON Formatter. Runs entirely in your browser.
[
{
"number": 1,
"symbol": "H",
"name": "Hydrogen",
"category": "Nonmetal",
"atomicMass": 1.008,
"period": 1,
"group": 1
},
{
"number": 2,
"symbol": "He",
"name": "Helium",
"category": "Noble Gas",
"atomicMass": 4.003,
"period": 1,
"group": 18
},
{
"number": 3,
"symbol": "Li",
"name": "Lithium",
"category": "Alkali Metal",
"atomicMass": 6.941,
"period": 2,
"group": 1
},
{
"number": 4,
"symbol": "Be",
"name": "Beryllium",
"category": "Alkaline Earth Metal",
"atomicMass": 9.012,
"period": 2,
"group": 2
},
{
"number": 5,
"symbol": "B",
"name": "Boron",
"category": "Metalloid",
"atomicMass": 10.811,
"period": 2,
"group": 13
},
{
"number": 6,
"symbol": "C",
"name": "Carbon",
"category": "Nonmetal",
"atomicMass": 12.011,
"period": 2,
"group": 14
},
{
"number": 7,
"symbol": "N",
"name": "Nitrogen",
"category": "Nonmetal",
"atomicMass": 14.007,
"period": 2,
"group": 15
},
{
"number": 8,
"symbol": "O",
"name": "Oxygen",
"category": "Nonmetal",
"atomicMass": 15.999,
"period": 2,
"group": 16
},
{
"number": 9,
"symbol": "F",
"name": "Fluorine",
"category": "Halogen",
"atomicMass": 18.998,
"period": 2,
"group": 17
},
{
"number": 10,
"symbol": "Ne",
"name": "Neon",
"category": "Noble Gas",
"atomicMass": 20.18,
"period": 2,
"group": 18
},
{
"number": 11,
"symbol": "Na",
"name": "Sodium",
"category": "Alkali Metal",
"atomicMass": 22.99,
"period": 3,
"group": 1
},
{
"number": 12,
"symbol": "Mg",
"name": "Magnesium",
"category": "Alkaline Earth Metal",
"atomicMass": 24.305,
"period": 3,
"group": 2
},
{
"number": 13,
"symbol": "Al",
"name": "Aluminum",
"category": "Post-Transition Metal",
"atomicMass": 26.982,
"period": 3,
"group": 13
},
{
"number": 14,
"symbol": "Si",
"name": "Silicon",
"category": "Metalloid",
"atomicMass": 28.086,
"period": 3,
"group": 14
},
{
"number": 15,
"symbol": "P",
"name": "Phosphorus",
"category": "Nonmetal",
"atomicMass": 30.974,
"period": 3,
"group": 15
},
{
"number": 16,
"symbol": "S",
"name": "Sulfur",
"category": "Nonmetal",
"atomicMass": 32.065,
"period": 3,
"group": 16
},
{
"number": 17,
"symbol": "Cl",
"name": "Chlorine",
"category": "Halogen",
"atomicMass": 35.453,
"period": 3,
"group": 17
},
{
"number": 18,
"symbol": "Ar",
"name": "Argon",
"category": "Noble Gas",
"atomicMass": 39.948,
"period": 3,
"group": 18
},
{
"number": 19,
"symbol": "K",
"name": "Potassium",
"category": "Alkali Metal",
"atomicMass": 39.098,
"period": 4,
"group": 1
},
{
"number": 20,
"symbol": "Ca",
"name": "Calcium",
"category": "Alkaline Earth Metal",
"atomicMass": 40.078,
"period": 4,
"group": 2
},
{
"number": 26,
"symbol": "Fe",
"name": "Iron",
"category": "Transition Metal",
"atomicMass": 55.845,
"period": 4,
"group": 8
},
{
"number": 29,
"symbol": "Cu",
"name": "Copper",
"category": "Transition Metal",
"atomicMass": 63.546,
"period": 4,
"group": 11
},
{
"number": 30,
"symbol": "Zn",
"name": "Zinc",
"category": "Transition Metal",
"atomicMass": 65.38,
"period": 4,
"group": 12
},
{
"number": 47,
"symbol": "Ag",
"name": "Silver",
"category": "Transition Metal",
"atomicMass": 107.868,
"period": 5,
"group": 11
},
{
"number": 50,
"symbol": "Sn",
"name": "Tin",
"category": "Post-Transition Metal",
"atomicMass": 118.71,
"period": 5,
"group": 14
},
{
"number": 79,
"symbol": "Au",
"name": "Gold",
"category": "Transition Metal",
"atomicMass": 196.967,
"period": 6,
"group": 11
},
{
"number": 80,
"symbol": "Hg",
"name": "Mercury",
"category": "Transition Metal",
"atomicMass": 200.592,
"period": 6,
"group": 12
},
{
"number": 82,
"symbol": "Pb",
"name": "Lead",
"category": "Post-Transition Metal",
"atomicMass": 207.2,
"period": 6,
"group": 14
},
{
"number": 92,
"symbol": "U",
"name": "Uranium",
"category": "Actinide",
"atomicMass": 238.029,
"period": 7,
"group": 3
}
]