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Np
Neptunium
#93 · Actinide
| Mass | 237.04817 u |
| Density | 20.45 g/cm³ |
| Melting | 917.0 K |
| Boiling | 4273.0 K |
| Electronegativity | 1.36 |
| Ionization Energy | 604.5 kJ/mol |
| Atomic Radius | 155.0 pm |
| Block | f-block |
| State (RT) | Solid |
| Config | [Rn] 5f4 6d1 7s2 |