34Se
Selenium
Nonmetal
Properties of Selenium
- Atomic number (Z)
- 34
- Symbol
- Se
- Name
- Selenium
- Atomic mass
- 78.96 u
- Period
- 4
- Group
- 16
- Family
- Chalcogens
- Classification
- Nonmetal
- Electron configuration
- [Ar] 3d¹⁰ 4s² 4p⁴
About Selenium
Selenium is a chemical element with symbol Se and atomic number 34 (atomic mass of about 78.96 u). It is classified as a nonmetal on the periodic table.
On the periodic table, Selenium is located in period 4, in group 16, belonging to the chalcogens family. An element's position reveals trends in its properties, such as atomic radius, electronegativity and metallic character.
The electron configuration of Selenium is [Ar] 3d¹⁰ 4s² 4p⁴, which determines how it forms chemical bonds and takes part in reactions.