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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)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Atomic Structure

    Electron Configuration

    1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵

    The electron configuration represents the distribution of electrons in atomic orbitals, showing how they are arranged in energy levels and subshells.

    Subatomic Particles

    Protons

    35

    Positive charge

    Neutrons

    45

    No charge

    Electrons

    35

    Negative charge

    Atomic Number & Mass Number

    The atomic number (35) represents the number of protons in the nucleus.

    The mass number (80) is the sum of protons and neutrons in the nucleus.

    Isotopes

    Isotopes are variants of an element that have the same number of protons but different numbers of neutrons.

    Br-79 (50.7%, stable)

    Br-81 (49.3%, stable)

    Periodic Table Location

    Period: 4

    Group: 17

    Category: Halogen

    The period indicates the main energy level, while the group suggests similar chemical properties.