Calcium
Alkaline earth metal| Atomic number | 20 |
|---|---|
| Category | Alkaline earth metal |
| Atomic mass | 40.078 |
| Electron configuration | [Ar]4s² |
| Oxidation states | +2 |
| Electronegativity | 1 |
| Melting point | 842 °C |
| Boiling point | 1,484 °C |
| Density | 1.55 g/cm³ |
| Crystal structure | Face-centred cubic |
| Group | 2 |
| Period | 4 |
| Block | s |
| Discovered | 1,808 |
| Crustal abundance | 41,500 ppm |
