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Actinium
ActiniumDownload Chemistry-applikationen for at se flere oplysninger om det kemiske element:
| Atomnummer | 89 |
| Gruppe | IIIB |
| Periode | 7 |
| Vægt | 227 |
| Latinsk navn | Actinium |
| Elektronkonfiguration | [Rn]6d7s2 |
| Oxidationstilstand | 0, 2, 3 |