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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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