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    Sb

    Antimony

    Metalloid

    Atomic Number: 51 • Atomic Mass: 121.7600 u • Period: 5 • Group: 15

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p³
    Phase: Solid
    Electronegativity: 2.05
    Tin (Sn)Tellurium (Te)
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    Physical & Chemical Properties

    Physical Properties

    • •Silvery, lustrous gray metalloid
    • •Brittle, crystalline solid
    • •Poor conductor of heat and electricity
    • •Expands on solidification like water/ice
    • •Can exist in several allotropic forms
    Melting Point

    903.78 K (630.63 °C, 1167.13 °F)

    Boiling Point

    1860 K (1586.85 °C, 2888.33 °F)

    Density

    6.685 g/cm³

    Electronegativity

    2.05 (Pauling scale)

    Chemical Properties

    • •Main oxidation states are -3, +3, and +5
    • •Forms antimony trioxide (Sb₂O₃) in air
    • •Dissolves in concentrated acids
    • •Can form complex compounds
    • •Both metallic and non-metallic chemical behavior

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p³

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