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| name |
Calcium |
| latin |
Calcium |
| french |
Calcium |
| german |
Calcium |
| symbol |
Ca |
| proton number |
20 |
| atomic weight |
40.078 |
| Pauling electronegativity |
1 |
| electronic configuration |
[Ar] 4s2
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| melting point |
1115 K, 842°C, 1547°F |
| boiling point |
1757 K, 1484°C, 2703°F |
| group |
2 |
| period |
4 |
| state (by 20°C) |
solid |
| oxidation states |
+2 |
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Discoverer
| Year of discovery |
Discoverer |
| 1808 |
Sir Humphry Davy (1778-1829) |
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Czech version