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    O

    Oxygen

    Nonmetal

    Atomic Number: 8 • Atomic Mass: 15.9990 u • Period: 2 • Group: 16

    Electron Configuration: 1s² 2s² 2p⁴
    Phase: Gas
    Electronegativity: 3.44
    Nitrogen (N)Fluorine (F)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Occurrence

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

    • Most abundant element in Earth's crust (46% by mass)
    • Makes up about 21% of Earth's atmosphere
    • Found in water, which covers 71% of Earth's surface
    • Third most abundant element in the universe after hydrogen and helium