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    Os

    Osmium

    Transition Metal

    Atomic Number: 76 • Atomic Mass: 190.2300 u • Period: 6 • Group: 8

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d⁶
    Phase: Solid
    Electronegativity: 2.2
    Rhenium (Re)Iridium (Ir)
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    History

    Osmium has been known since ancient times

    Historical Timeline

    Discovered in platinum residues

    Named for the strong odor of its oxide