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    Br

    Bromine

    Halogen

    Atomic Number: 35 • Atomic Mass: 79.9040 u • Period: 4 • Group: 17

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵
    Phase: Liquid
    Electronegativity: 2.96
    Selenium (Se)Krypton (Kr)
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    Physical & Chemical Properties

    Physical Properties

    • •Reddish-brown liquid at room temperature
    • •Only nonmetallic element that is liquid at standard conditions
    • •Readily evaporates to form reddish-brown vapor
    • •Strong, irritating odor similar to chlorine
    • •Soluble in many organic solvents
    Melting Point

    265.8 K (-7.35 °C, 18.77 °F)

    Boiling Point

    332 K (58.85 °C, 137.93 °F)

    Density

    3.122 g/cm³

    Electronegativity

    2.96 (Pauling scale)

    Chemical Properties

    • •Main oxidation states are -1, +1, +3, +5
    • •Highly reactive halogen
    • •Less reactive than chlorine but more reactive than iodine
    • •Forms salts called bromides
    • •Readily oxidizes metals and many nonmetals

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵

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