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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)
    OverviewPropertiesAtomic StructureOccurrenceApplicationsHistory

    Overview

    Neptunium is the chemical element with the symbol Np and atomic number 93. It belongs to the Actinide group and is located in period 7 of the periodic table. It exists as a solid under standard conditions.

    Basic Information

    • Symbol:Np
    • Atomic Number:93
    • Atomic Mass:237.0000 u
    • Group:102
    • Period:7
    • Category:Actinide
    • Phase at STP:Solid
    • Electronegativity:1.36 (Pauling scale)

    Key Facts

    Fun Fact #1

    Named after planet Neptune

    Fun Fact #2

    First synthetic transuranium element

    Common Uses

    • Nuclear weapons detection
    • Nuclear reactors
    • Neutron detection