Calcium is an alkaline earth metal from the periodic table. It is a silvery-white metal that is the fifth most abundant element in the Earth's crust. Calcium is essential for life and is found in many common foods. It is also used in the production of cement, paper and glass.
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| Atomic number | 20 |
| Group | IIA |
| Period | 4 |
| Mass | 40.078 |
| Latin name | Calcium |
| Electron configuration | [Ar]4s2 |
| Oxidation state | 0, 1, 2 |