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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

    Atomic Structure

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p³

    The electron configuration represents the distribution of electrons in atomic orbitals, showing how they are arranged in energy levels and subshells.

    Subatomic Particles

    Protons

    33

    Positive charge

    Neutrons

    42

    No charge

    Electrons

    33

    Negative charge

    Atomic Number & Mass Number

    The atomic number (33) represents the number of protons in the nucleus.

    The mass number (75) is the sum of protons and neutrons in the nucleus.

    Isotopes

    Isotopes are variants of an element that have the same number of protons but different numbers of neutrons.

    As-75 (100%, stable)

    Periodic Table Location

    Period: 4

    Group: 15

    Category: Metalloid

    The period indicates the main energy level, while the group suggests similar chemical properties.