Fermium vs Mendelevium
Pick up to 3 elements and see how they stack up.
| Property | Fermium | Mendelevium |
|---|---|---|
| Atomic number | 100 | 101 |
| Atomic mass | 257 | 258 |
| Electronegativity | 1.3 | 1.3 |
| Melting point | 1,800 K (1,526.8 °C) | 1,100 K (826.8 °C) |
| Boiling point | — | — |
| Density | — | — |
| Atomic radius | — | — |
| Ionization energy | 6.5 eV | 6.58 eV |
| Discovered | 1952 | 1955 |
| Category | Actinide | Actinide |
| State at room temp. | Solid | Solid |
| Block | f | f |
| Group | — | — |
| Period | 7 | 7 |
| Valence electrons | 2 | 2 |
| Common charges | +3 | +2, +3 |
| Electron configuration | [Rn] 5f12 7s2 | [Rn] 5f13 7s2 |