Calcium vs Iron
Pick up to 3 elements and see how they stack up.
| Property | Calcium | Iron |
|---|---|---|
| Atomic number | 20 | 26 |
| Atomic mass | 40.078 | 55.845 |
| Electronegativity | 1 | 1.83 |
| Melting point | 1,115 K (841.8 °C) | 1,811 K (1,537.8 °C) |
| Boiling point | 1,757 K (1,483.8 °C) | 3,134 K (2,860.8 °C) |
| Density | 1.54 g/cm³ | 7.874 g/cm³ |
| Atomic radius | 231 pm | 194 pm |
| Ionization energy | 6.113 eV | 7.902 eV |
| Discovered | 1808 | Ancient |
| Category | Alkaline earth metal | Transition metal |
| State at room temp. | Solid | Solid |
| Block | s | d |
| Group | 2 | 8 |
| Period | 4 | 4 |
| Valence electrons | 2 | 2 |
| Common charges | +2 | +2, +3 |
| Electron configuration | [Ar] 4s2 | [Ar] 3d6 4s2 |