| Property | Value |
|---|---|
| Atomic number | 20 |
| Atomic weight | 40.0784 amu |
| Element family | Alkali earth metals |
| Electronic configuration | 1s2 |
| Stable and very long lived isotopes | 40Ca: 96.941%, 42Ca: 0.647%, 43Ca: 0.135%, 44Ca: 2.086%, 46Ca: 0.004% |
| Previous element | Potassium |
| Next element | Scandium |
| Density | 1.54 g/cm3 (STP) |
| Melting | 839 °C |
| Boiling | 1487 °C |
| Covalent radius | 1.71 Å |
| Van der Waals radius | 2.31 Å |
| Ionic radius | 0.99 Å |
| Metallic radius | 1.97 Å |
| First ionization potential | 6.113 eV |
| Electron affinity | 0.025 eV |
| Electronegativity | 1 |
| Discovery year | 1808 |
Calcium is an element number 20 from alkali earth metals family. Its symbol is Ca. Calcium atomic weight is 40.0784 amu. Ca stable and long lived isotopes are 40Ca: 96.941%, 42Ca: 0.647%, 43Ca: 0.135%, 44Ca: 2.086%, 46Ca: 0.004%. Calcium electronic configuration is 1s22s22p63s23p64s2. Sample compounds that contain Calcium are CaCO3, CaCl2, Ca(OH)2, Ca3(PO4)2, Ca(NO3)2, CaO.
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