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Seleen
| 34 |
6 18 8 2 |
| Se 78,96 |
|
| Seleen |
Seleen on keemiline element järjenumbriga 34, mittemetall.
Tal on 6 stabiilset isotoopi massiarvudega 74, 76, 77, 78, 80 ja 82.
Seleenil on mitu allotroopset vormi. Levinuim neist on hall pooljuhtiv tahke aine tihedusega 4,8 g/cm³, mis sulab temperatuuril 217 °C ja keeb temperatuuril 684 °C.
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