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    Na

    Sodium

    Alkali Metal

    Atomic Number: 11 • Atomic Mass: 22.9900 u • Period: 3 • Group: 1

    Electron Configuration: 1s² 2s² 2p⁶ 3s¹
    Phase: Solid
    Electronegativity: 0.93
    Neon (Ne)Magnesium (Mg)
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    Physical & Chemical Properties

    Physical Properties

    • •Soft, silvery-white metal
    • •Low density (floats on water)
    • •Low melting point compared to most metals
    • •Excellent electrical and thermal conductor
    Melting Point

    370.87 K (97.72 °C, 207.90 °F)

    Boiling Point

    1156 K (882.85 °C, 1621.13 °F)

    Density

    0.971 g/cm³

    Electronegativity

    0.93 (Pauling scale)

    Chemical Properties

    • •Highly reactive, must be stored under oil
    • •Reacts vigorously with water producing hydrogen gas
    • •Forms ionic compounds with +1 oxidation state
    • •Strong reducing agent

    Electron Configuration

    1s² 2s² 2p⁶ 3s¹

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