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Calcium is a soft alkaline earth metal known since ancient Roman times but not isolated until 1808 by Sir Humphry Davy.
| Name | Calcium |
| Atomic Number | 20 |
| Atomic Weight | |
| Symbol | Ca |
| Melting Point ( °C ) | |
| Boiling Point ( °C ) | |
| Density (g/cm3) | |
| Earth crust (%) | |
| Discovery (Year) | |
| Group | |
| Electron configuration | |
| Ionization energy (eV) |
