Periodic Table · element
Selenium
Se · Z 34
- atomic number
- 34
- atomic mass
- 78.971
- notation
- Se
- group
- 16: Oxygen
- period
- 4
- state0c
- Solid
- state20c
- Solid
- occurrence
- Primordial
- density
- 4.81
- melting pt
- 220
- boiling pt
- 685
- discovered
- 1817
- abundance
- 0.05
- bio class
- Trace
- bio role
- In selenocysteine, the twenty-first amino acid, at the active site of the glutathione peroxidases that clear peroxides.
- ore minerals
- in copper sulfides
- mined as
- By-product
- extraction
- From the anode slimes of copper electrorefining, roasted and leached.
categories
#Nonmetal#Polyatomic nonmetal#Chalcogens
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