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    At

    Astatine

    Halogen

    Atomic Number: 85 • Atomic Mass: 210.0000 u • Period: 6 • Group: 17

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁵
    Phase: Solid
    Electronegativity: 2.2
    Polonium (Po)Radon (Rn)
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    Physical & Chemical Properties

    Physical Properties

    • •Likely metallic appearance
    • •Highly radioactive
    • •Most similar to iodine
    Melting Point

    575 K (301.85 °C, 575.33 °F)

    Boiling Point

    610 K (336.85 °C, 638.33 °F)

    Density

    7 g/cm³

    Electronegativity

    2.2 (Pauling scale)

    Chemical Properties

    • •Most metallic of the halogens
    • •Forms interhalogen compounds
    • •Oxidizes easily

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁵

    Electron configuration describes how electrons are distributed in atomic orbitals, showing how they are arranged in energy levels and subshells.