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    Tb

    Terbium

    Lanthanide

    Atomic Number: 65 • Atomic Mass: 158.9300 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁹
    Phase: Solid
    Electronegativity: 1.2
    Gadolinium (Gd)Dysprosium (Dy)
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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white metal
    • •Malleable
    • •Highly magnetic
    Melting Point

    1629 K (1355.85 °C, 2472.53 °F)

    Boiling Point

    3503 K (3229.85 °C, 5845.73 °F)

    Density

    8.229 g/cm³

    Electronegativity

    1.2 (Pauling scale)

    Chemical Properties

    • •Forms trivalent compounds
    • •Oxidizes in air
    • •Reacts with water

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁹

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