| name | Selenium |
| latin | Selenium |
| french | Sélénium |
| german | Selen |
| symbol | Se |
| proton number | 34 |
| atomic weight | 78.96 |
| Pauling electronegativity | 2.55 |
| electronic configuration | [Ar] 3d104s24p4 1s22s22p63s23p63d104s24p4 |
| melting point | 494 K, 221°C, 430°F |
| boiling point | 958 K, 685°C, 1265°F |
| group | 16 |
| period | 4 |
| state (by 20°C) | solid |
| oxidation states | -2, +4, +6 |
| Year of discovery | Discoverer |
| 1817 | Jons J. Berzelius (1779-1848) |