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Calcium (Ca)
Atomic number 20 · alkaline
| Atomic number | 20 |
|---|---|
| Atomic mass | 40.078 u |
| Molar mass | 40.078 g/mol |
| Category | alkaline |
| Group / period / block | 2 / 4 / s |
| Electron configuration | [Ar] 4s2 |
| Electrons per shell | 2, 8, 8, 2 |
| Electronegativity (Pauling) | 1.0 |
| Atomic radius | 180.0 pm |
| Density | 1.54 g/cm³ |
| First ionisation energy | 6.1132 eV |
| Melting point | 1115.15 K (842.00 °C) |
| Boiling point | 1757.15 K (1484.00 °C) |
| Common oxidation states | +2 |
| Abundance in Earth's crust | 41500 ppm |
Uses
Bones and teeth, cement, chalk, lime
Discovery
1808, Sir Humphrey Davy