Compare Element Properties
| Property | Np Neptunium | ? N/A |
|---|---|---|
| Atomic number | 93 | N/A |
| Symbol | Np | N/A |
| Name | Neptunium | N/A |
| Category | actinide | N/A |
| Standard Atomic Weight | 237 u | N/A |
| Period | 7 | N/A |
| Group | N/A | N/A |
| Block | s | N/A |
| Phase at STP | solid | N/A |
| Electron configuration | [Rn]7s25f46d1 | N/A |
| Oxidation states | [2, 3, 4, 5, 6, 7] | N/A |
| Electronegativity (Pauling) | 1.36 | N/A |
| Electron affinity | 0.48 eV | N/A |
| Density | 2.025000e+4 kg/m³ | N/A |
| Melting point | 643.85 °C | N/A |
| Boiling point | 3901.85 °C | N/A |
| Discovery year | 1940 | N/A |