Iron vs Cobalt
Pick up to 3 elements and see how they stack up.
| Property | Iron | Cobalt |
|---|---|---|
| Atomic number | 26 | 27 |
| Atomic mass | 55.845 | 58.933 |
| Electronegativity | 1.83 | 1.88 |
| Melting point | 1,811 K (1,537.8 °C) | 1,768 K (1,494.8 °C) |
| Boiling point | 3,134 K (2,860.8 °C) | 3,200 K (2,926.8 °C) |
| Density | 7.874 g/cm³ | 8.9 g/cm³ |
| Atomic radius | 194 pm | 192 pm |
| Ionization energy | 7.902 eV | 7.881 eV |
| Discovered | Ancient | 1735 |
| Category | Transition metal | Transition metal |
| State at room temp. | Solid | Solid |
| Block | d | d |
| Group | 8 | 9 |
| Period | 4 | 4 |
| Valence electrons | 2 | 2 |
| Common charges | +2, +3 | +2, +3 |
| Electron configuration | [Ar] 3d6 4s2 | [Ar] 3d7 4s2 |