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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)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Astatine has been known since ancient times

    Historical Timeline

    Synthesized by bombarding bismuth with alpha particles

    Named for its instability