Neptunium
Actinide| Atomic number | 93 |
|---|---|
| Category | Actinide |
| Atomic mass | 237 |
| Electron configuration | [Rn]5f⁴ 6d¹ 7s² |
| Oxidation states | +5 |
| Electronegativity | 1.36 |
| Melting point | 644 °C |
| Boiling point | 3,902 °C |
| Density | 20.45 g/cm³ |
| Crystal structure | Orthorhombic |
| Period | 7 |
| Block | f |
| Discovered | 1,940 |
| Crustal abundance | 0 ppm |