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    Cl

    Chlorine

    Halogen

    Atomic Number: 17 • Atomic Mass: 35.4500 u • Period: 3 • Group: 17

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁵
    Phase: Gas
    Electronegativity: 3.16
    Sulfur (S)Argon (Ar)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Occurrence

    Chlorine is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • 21st most abundant element in Earth's crust
    • Second most abundant halogen after fluorine in Earth's crust
    • Found mainly in seawater and salt lakes as sodium chloride
    • Present in many minerals including halite, carnallite, and sylvite