Back to Elements
    Xe

    Xenon

    Noble Gas

    Atomic Number: 54 • Atomic Mass: 131.2900 u • Period: 5 • Group: 18

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶
    Phase: Gas
    Electronegativity: 2.6
    Iodine (I)Cesium (Cs)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Xenon has been known since ancient times

    Historical Timeline

    Discovered in the residue after evaporating components of liquid air

    Last of the stable noble gases to be discovered

    First noble gas shown to form chemical compounds (1962)