# actinium

> chemical element with symbol Ac and atomic number 89

**Wikidata**: [Q1121](https://www.wikidata.org/wiki/Q1121)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Actinium)  
**Source**: https://4ort.xyz/entity/actinium


## References

1. CRC Handbook of Chemistry and Physics (78th edition)
2. [Source](http://www.commonchemistry.org/index.aspx)
3. actinium. Global Substance Registration System
4. [CAS Common Chemistry](https://commonchemistry.cas.org/detail?cas_rn=7440-34-8)
5. ACTINIUM. PubChem
6. ChEBI release 2020-09-01
7. Atomic weights of the elements 2009 (IUPAC Technical Report)
8. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=67637)
9. [Source](https://www.cns11643.gov.tw/wordView.jsp?ID=154422)
10. Freebase Data Dumps. 2013
11. Actinium. ChemSpider
12. ChEBI release 2019-10-02
13. actinium atom. ChEBI
14. Integrated Authority File
15. BabelNet
16. Mapping file of InChIStrings, InChIKeys and DTXSIDs for the EPA CompTox Dashboard
17. National Library of Israel
18. KBpedia
19. GF WordNet
20. UniChem