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Elemental Periodic Table

neptunium

Atomic number: 93
Atomic weight: 237
Symbol: Np
Group number: (actinide)
Electronic configuration: [Rn].5f4.6d1.7s2


Physical data

Standard state: solid at 298 K
Colour: silvery metallic
Density of solid at ambient temperature/kg m-3: 20450
Molar volume/cm3: 11.59


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