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    Fr

    Francium

    Alkali Metal

    Atomic Number: 87 • Atomic Mass: 223.0000 u • Period: 7 • Group: 1

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹
    Phase: Solid
    Electronegativity: 0.7
    Radon (Rn)Radium (Ra)
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    Physical & Chemical Properties

    Physical Properties

    • •Likely silver-colored
    • •Highly radioactive
    • •Expected to be liquid at room temperature
    Melting Point

    300 K (26.85 °C, 80.33 °F)

    Boiling Point

    950 K (676.85 °C, 1250.33 °F)

    Density

    1.87 g/cm³

    Electronegativity

    0.7 (Pauling scale)

    Chemical Properties

    • •Highly reactive
    • •Properties estimated from other alkali metals
    • •Forms +1 ions

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹

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