Einsteinium vs Fermium
Pick up to 3 elements and see how they stack up.
| Property | Einsteinium | Fermium |
|---|---|---|
| Atomic number | 99 | 100 |
| Atomic mass | 252 | 257 |
| Electronegativity | 1.3 | 1.3 |
| Melting point | 1,133 K (859.8 °C) | 1,800 K (1,526.8 °C) |
| Boiling point | 1,269 K (995.8 °C) | — |
| Density | 8.84 g/cm³ | — |
| Atomic radius | 245 pm | — |
| Ionization energy | 6.42 eV | 6.5 eV |
| Discovered | 1952 | 1952 |
| Category | Actinide | Actinide |
| State at room temp. | Solid | Solid |
| Block | f | f |
| Group | — | — |
| Period | 7 | 7 |
| Valence electrons | 2 | 2 |
| Common charges | +3 | +3 |
| Electron configuration | [Rn] 5f11 7s2 | [Rn] 5f12 7s2 |