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    As

    Arsenic

    Metalloid

    Atomic Number: 33 • Atomic Mass: 74.9220 u • Period: 4 • Group: 15

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³
    Phase: Solid
    Electronegativity: 2.18
    Germanium (Ge)Selenium (Se)
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    Occurrence

    Arsenic is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • 51st most abundant element in Earth's crust (0.00021%)
    • Rarely found as native element
    • Common minerals include arsenopyrite, orpiment, and realgar
    • Often associated with ores of gold, copper, and lead
    • Present in some mineral waters and volcanic gases