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    Co

    Cobalt

    Transition Metal

    Atomic Number: 27 • Atomic Mass: 58.9330 u • Period: 4 • Group: 9

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷
    Phase: Solid
    Electronegativity: 1.88
    Iron (Fe)Nickel (Ni)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Cobalt has been known since ancient times

    Historical Timeline

    First isolated by Swedish chemist Georg Brandt in 1735

    Named after kobolds, as miners believed these spirits poisoned ore and caused health problems

    Cobalt compounds have been used for blue pigments since ancient times