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    Os

    Osmium

    Transition Metal

    Atomic Number: 76 • Atomic Mass: 190.2300 u • Period: 6 • Group: 8

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁶
    Phase: Solid
    Electronegativity: 2.2
    Rhenium (Re)Iridium (Ir)
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    Physical & Chemical Properties

    Physical Properties

    • •Blue-gray appearance
    • •Extremely dense
    • •Highest melting point of platinum group
    Melting Point

    3306 K (3032.85 °C, 5491.13 °F)

    Boiling Point

    5285 K (5011.85 °C, 9053.33 °F)

    Density

    22.59 g/cm³

    Electronegativity

    2.2 (Pauling scale)

    Chemical Properties

    • •Forms multiple oxidation states
    • •Extremely resistant to corrosion
    • •Forms volatile tetroxide

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁶

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