Back to Elements
    Rn

    Radon

    Noble Gas

    Atomic Number: 86 • Atomic Mass: 222.0000 u • Period: 6 • Group: 18

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶
    Phase: Gas
    Electronegativity: 2.2
    Astatine (At)Francium (Fr)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Radon has been known since ancient times

    Historical Timeline

    Initially called 'radium emanation'

    Named radon in 1923