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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)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Arsenic is the chemical element with the symbol As and atomic number 33. It belongs to the Metalloid group and is located in period 4 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:As
    • Atomic Number:33
    • Atomic Mass:74.9220 u
    • Group:15
    • Period:4
    • Category:Metalloid
    • Phase at STP:Solid
    • Electronegativity:2.18 (Pauling scale)

    Key Facts

    Fun Fact #1

    Known poison since ancient times

    Fun Fact #2

    Used in homeopathic medicine

    Common Uses

    • Wood preservatives
    • Pesticides
    • Semiconductors