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    Eu

    Europium

    Lanthanide

    Atomic Number: 63 • Atomic Mass: 151.9600 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷
    Phase: Solid
    Electronegativity: 1.2
    Samarium (Sm)Gadolinium (Gd)
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    Physical & Chemical Properties

    Physical Properties

    • •Silvery-white metal
    • •Soft and ductile
    • •Most reactive lanthanide
    Melting Point

    1099 K (825.85 °C, 1518.53 °F)

    Boiling Point

    1802 K (1528.85 °C, 2783.93 °F)

    Density

    5.243 g/cm³

    Electronegativity

    1.2 (Pauling scale)

    Chemical Properties

    • •Forms +2 and +3 oxidation states
    • •Reacts with water
    • •Strong reducing agent

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f⁷

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