Plutonium vs Americium
Pick up to 3 elements and see how they stack up.
| Property | Plutonium | Americium |
|---|---|---|
| Atomic number | 94 | 95 |
| Atomic mass | 244 | 243 |
| Electronegativity | 1.28 | 1.3 |
| Melting point | 912.5 K (639.4 °C) | 1,449 K (1,175.8 °C) |
| Boiling point | 3,505 K (3,231.8 °C) | 2,880 K (2,606.8 °C) |
| Density | 19.82 g/cm³ | 12 g/cm³ |
| Atomic radius | 243 pm | 244 pm |
| Ionization energy | 6.06 eV | 5.993 eV |
| Discovered | 1940 | 1944 |
| 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] 5f6 7s2 | [Rn] 5f7 7s2 |