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    Ga

    Gallium

    Post Transition

    Atomic Number: 31 • Atomic Mass: 69.7230 u • Period: 4 • Group: 13

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹
    Phase: Solid
    Electronegativity: 1.81
    Zinc (Zn)Germanium (Ge)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Gallium has been known since ancient times

    Historical Timeline

    Predicted by Mendeleev in 1871 as 'eka-aluminum'

    Discovered spectroscopically by Lecoq de Boisbaudran in 1875

    Properties closely matched Mendeleev's predictions, helping validate the periodic table