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    Pr

    Praseodymium

    Lanthanide

    Atomic Number: 59 • Atomic Mass: 140.9100 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f³
    Phase: Solid
    Electronegativity: 1.13
    Cerium (Ce)Neodymium (Nd)
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    Physical & Chemical Properties

    Physical Properties

    • •Soft silvery metal
    • •Malleable
    • •Tarnishes in air
    Melting Point

    1208 K (934.85 °C, 1714.73 °F)

    Boiling Point

    3793 K (3519.85 °C, 6367.73 °F)

    Density

    6.773 g/cm³

    Electronegativity

    1.13 (Pauling scale)

    Chemical Properties

    • •Highly reactive
    • •Forms trivalent ions
    • •Paramagnetic properties

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f³

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