Selenium (Se)
A fascinating nonmetal element.
Selenium is element 34 on the periodic table.
Element properties
- Atomic number
- 34
- Symbol
- Se
- Atomic mass
- 78.971 u
- Category
- Nonmetal
- Period
- 4
- Group
- 16
- Block
- p
- State
- Solid
- Electron configuration
- [Ar] 3d10 4s2 4p4
- Electronegativity (Pauling)
- 2.55
- Density
- 4.81 g/cm³
- Melting point
- 221 °C
- Boiling point
- 685 °C