Selenium
Selenium (Se) is a chemical element belonging to the category Metalloid, with atomic number 34 and atomic mass 78.9710 u. This sheet describes its fundamental properties, periodic position and physical characteristics.
Identity
- Name: Selenium
- Symbol: Se
- Atomic number: 34
- Atomic mass: 78.9710 u
Position in the periodic table
- Group: 16
- Period: 4
- Category: Metalloid
Physico-chemical properties
- Standard state: Solid
- Melting point: 221 °C
- Boiling point: 685 °C
- Density: 4.81 g/cm³
- Electron configuration: [Ar] 3d¹⁰ 4s² 4p⁴
Scientific description
Selenium is a chemical element with symbol Se and atomic number 34. It belongs to the category of Metalloid and occupies group 16 and period 4. Its standard atomic mass is 78.9710 u.
KODO: J7