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    Indium

    Post Transition

    Atomic Number: 49 • Atomic Mass: 114.8200 u • Period: 5 • Group: 13

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p¹
    Phase: Solid
    Electronegativity: 1.78
    Cadmium (Cd)Tin (Sn)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Indium has been known since ancient times

    Historical Timeline

    Discovered spectroscopically while examining zinc ores

    Found through its bright indigo blue spectral line

    Named for the indigo color of this spectroscopic line