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Neptunium (Np)
Atomic number 93 · Actinide
| Atomic number | 93 |
|---|---|
| Atomic mass | 237.0 u |
| Molar mass | 237.0 g/mol |
| Category | Actinide |
| Group / period / block | — / 7 / f |
| Electron configuration | [Rn] 5f4 6d 7s2 |
| Electrons per shell | 2, 8, 18, 32, 22, 9, 2 |
| Electronegativity (Pauling) | 1.3 |
| Atomic radius | 175.0 pm |
| Density | 20.2 g/cm³ |
| First ionisation energy | 6.2655 eV |
| Melting point | 917.15 K (644.00 °C) |
| Common oxidation states | +5 |
Uses
Neutron detectors, research
Discovery
1940, E.M. McMillan, P.H. Abelson