Uranium vs Neptunium
Pick up to 3 elements and see how they stack up.
| Property | Uranium | Neptunium |
|---|---|---|
| Atomic number | 92 | 93 |
| Atomic mass | 238.03 | 237 |
| Electronegativity | 1.38 | 1.36 |
| Melting point | 1,405.3 K (1,132.2 °C) | 912 K (638.8 °C) |
| Boiling point | 4,404 K (4,130.8 °C) | 4,447 K (4,173.8 °C) |
| Density | 19.1 g/cm³ | 20.45 g/cm³ |
| Atomic radius | 240 pm | 221 pm |
| Ionization energy | 6.194 eV | 6.266 eV |
| Discovered | 1789 | 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] 5f3 6d1 7s2 | [Rn] 5f4 6d1 7s2 |