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    Ir

    Iridium

    Transition Metal

    Atomic Number: 77 • Atomic Mass: 192.2200 u • Period: 6 • Group: 9

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁷
    Phase: Solid
    Electronegativity: 2.2
    Osmium (Os)Platinum (Pt)
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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white appearance
    • •Extremely hard
    • •Brittle at room temperature
    Melting Point

    2719 K (2445.85 °C, 4434.53 °F)

    Boiling Point

    4701 K (4427.85 °C, 8002.13 °F)

    Density

    22.56 g/cm³

    Electronegativity

    2.2 (Pauling scale)

    Chemical Properties

    • •Extremely resistant to corrosion
    • •Forms compounds in multiple oxidation states
    • •Resistant to acids

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁷

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