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    Er

    Erbium

    Lanthanide

    Atomic Number: 68 • Atomic Mass: 167.2600 u • Period: 6 • Group: 101

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹²
    Phase: Solid
    Electronegativity: 1.24
    Holmium (Ho)Thulium (Tm)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    History

    Erbium has been known since ancient times

    Historical Timeline

    Extracted from yttria

    Pure metal first isolated in 1934