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Selen
SelenLadda ner Chemistry-applikationen för att se mer information om det kemiska elementet:
| Atomnummer | 34 |
| Periodiska systemets grupper | VIA |
| Periodiska systemets perioder | 4 |
| Massa | 78.96 |
| Latinskt namn | Selenium |
| Elektronkonfiguration | [Ar]3d10 4s2 4p4 |
| Oxidationstillstånd | -2, -1, 0, 1, 2, 3, 4, 5, 6 |