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    Ra

    Radium

    Alkaline Earth

    Atomic Number: 88 • Atomic Mass: 226.0000 u • Period: 7 • Group: 2

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²
    Phase: Solid
    Electronegativity: 0.9
    Francium (Fr)Actinium (Ac)
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    History

    Radium has been known since ancient times

    Historical Timeline

    Isolated from pitchblende

    Named for its radioactive rays