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    Ni

    Nickel

    Transition Metal

    Atomic Number: 28 • Atomic Mass: 58.6930 u • Period: 4 • Group: 10

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸
    Phase: Solid
    Electronegativity: 1.91
    Cobalt (Co)Copper (Cu)
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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white, hard, ductile metal
    • •Ferromagnetic but becomes paramagnetic above 355°C
    • •Excellent conductor of heat and electricity
    • •High polish and tarnish resistance
    • •Moderate thermal expansion
    Melting Point

    1728 K (1454.85 °C, 2650.73 °F)

    Boiling Point

    3186 K (2912.85 °C, 5275.13 °F)

    Density

    8.912 g/cm³

    Electronegativity

    1.91 (Pauling scale)

    Chemical Properties

    • •Main oxidation state is +2, though states from -1 to +4 exist
    • •Resistant to corrosion in air at room temperature
    • •Slowly reactive with dilute acids
    • •Good catalyst for hydrogenation reactions
    • •Forms many complexes, often green or blue in color

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁸

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