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    Np

    Neptunium

    Actinide

    Atomic Number: 93 • Atomic Mass: 237.0000 u • Period: 7 • Group: 102

    Electron Configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f⁴ 6d¹
    Phase: Solid
    Electronegativity: 1.36
    Uranium (U)Plutonium (Pu)
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    History

    Neptunium has been known since ancient times

    Historical Timeline

    First transuranium element to be synthesized