Neptunium vs Plutonium
Pick up to 3 elements and see how they stack up.
| Property | Neptunium | Plutonium |
|---|---|---|
| Atomic number | 93 | 94 |
| Atomic mass | 237 | 244 |
| Electronegativity | 1.36 | 1.28 |
| Melting point | 912 K (638.8 °C) | 912.5 K (639.4 °C) |
| Boiling point | 4,447 K (4,173.8 °C) | 3,505 K (3,231.8 °C) |
| Density | 20.45 g/cm³ | 19.82 g/cm³ |
| Atomic radius | 221 pm | 243 pm |
| Ionization energy | 6.266 eV | 6.06 eV |
| Discovered | 1940 | 1940 |
| Category | Actinide | Actinide |
| State at room temp. | Solid | Solid |
| Block | f | f |
| Group | — | — |
| Period | 7 | 7 |
| Valence electrons | 2 | 2 |
| Common charges | +3, +4, +5, +6 | +3, +4, +5, +6 |
| Electron configuration | [Rn] 5f4 6d1 7s2 | [Rn] 5f6 7s2 |