| Property | Value |
|---|---|
| Atoomnummer | 20 |
| Atoomgewicht | 40.0784 amu |
| Element family | Aardalkalimetalen |
| Elektronische configuratie | 1s2 |
| Stable and very long lived isotopes | 40Ca: 96.941%, 42Ca: 0.647%, 43Ca: 0.135%, 44Ca: 2.086%, 46Ca: 0.004% |
| Previous element | Kalium |
| Next element | Scandium |
| Dichtheid | 1.54 g/cm3 (STP) |
| Smelten | 839 °C |
| Kookpunt | 1487 °C |
| Covalente straal | 1.71 Å |
| Van der Waals straal | 2.31 Å |
| Ionstraal | 0.99 Å |
| Metalic radius | 1.97 Å |
| Eerst ionisatiepotentiaal | 6.113 eV |
| Elektronenaffiniteit | 0.025 eV |
| Electronegativity | 1 |
| Discovery year | 1808 |
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