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    Lu

    Lutetium

    Lanthanide

    Atomic Number: 71 • Atomic Mass: 174.9700 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹
    Phase: Solid
    Electronegativity: 1.27
    Ytterbium (Yb)Hafnium (Hf)
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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white metal
    • •High melting point
    • •Hardest and densest lanthanide
    Melting Point

    1925 K (1651.85 °C, 3005.33 °F)

    Boiling Point

    3675 K (3401.85 °C, 6155.33 °F)

    Density

    9.84 g/cm³

    Electronegativity

    1.27 (Pauling scale)

    Chemical Properties

    • •Forms trivalent compounds
    • •Resistant to corrosion
    • •Low reactivity for a lanthanide

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹

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