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    Kr

    Krypton

    Noble Gas

    Atomic Number: 36 • Atomic Mass: 83.7980 u • Period: 4 • Group: 18

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
    Phase: Gas
    Electronegativity: 3
    Bromine (Br)Rubidium (Rb)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Occurrence

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

    • Rare in Earth's atmosphere (1.14 ppm by volume)
    • Produced during nuclear fission of uranium and plutonium
    • Present in some mineral springs
    • Small traces found in meteorites
    • Far more abundant in the universe than on Earth