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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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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white metal
    • •Luminescent
    • •Slightly lower density than barium
    Melting Point

    973 K (699.85 °C, 1291.73 °F)

    Boiling Point

    2010 K (1736.85 °C, 3158.33 °F)

    Density

    5.5 g/cm³

    Electronegativity

    0.9 (Pauling scale)

    Chemical Properties

    • •Highly radioactive
    • •Reacts with nitrogen
    • •Forms salts similar to barium

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s²

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