Se
34 polyatomic nonmetal Generated with AI
Selenium
Symbol Se
Atomic Mass 78.9718
Selenium is a chemical element with symbol Se and atomic number 34. It is a nonmetal with properties that are intermediate between those of its periodic table column-adjacent chalcogen elements sulfur and tellurium. It rarely occurs in its elemental state in nature, or as pure ore compounds.
Properties
- Phase: Solid
- Density: 4.81 g/cm³
- Melting Point: 494 K
- Boiling Point: 958 K