Selenium is a chemical element from the periodic table. It is a non-metal with properties between those of metal and non-metal elements. Selenium is primarily used in electronics, such as photocells and solar cells. It is also used in the production of optical glass and pigments. Selenium is silvery-grey in color, and is usually found in combination with sulfur and metals.
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| Atomic number | 34 |
| Group | VIA |
| Period | 4 |
| Mass | 78.96 |
| Latin name | Selenium |
| Electron configuration | [Ar]3d10 4s2 4p4 |
| Oxidation state | -2, -1, 0, 1, 2, 3, 4, 5, 6 |