At koobaltskööl as det 9. skööl faan a cheemisk elementen. Det san koobalt, roodium, iriidium an det konstelk element meitneerium. Jo hiar aaltumaal tu det seerie faan a auergungsmetalen.
 Tekst üüb Öömrang |
| Skööl | 9 |
| Periode | |
| 4 | 27 Co |
| 5 | 45 Rh |
| 6 | 77 Ir |
| 7 | 109 Mt |
Bilen
- Metalen uun't koobaltskööl
Koobalt, 99,9 %
Roodium, 99,99 %
Iriidium, 99,98 %
Luke uk diar
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