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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

    Occurrence

    Erbium is found in various natural sources, including minerals, rocks, and the Earth's crust.

    • Earth's crust (3.5 parts per million)
    • Xenotime mineral
    • Euxenite mineral