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    H

    Hydrogen

    Nonmetal

    Atomic Number: 1 • Atomic Mass: 1.0080 u • Period: 1 • Group: 1

    Electron Configuration: 1s¹
    Phase: Gas
    Electronegativity: 2.2
    Helium (He)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Hydrogen has been known since ancient times

    Historical Timeline

    Recognized as a distinct substance by Henry Cavendish in 1766

    Named hydrogen by Antoine Lavoisier in 1783

    First isolated in relatively pure form by Paracelsus in the 16th century