# isotope of protactinium

> Nuclides with atomic number Z = 91 but with different mass numbers

**Wikidata**: [Q2498986](https://www.wikidata.org/wiki/Q2498986)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Isotopes_of_protactinium)  
**Source**: https://4ort.xyz/entity/isotope-of-protactinium


## References

1. Freebase Data Dumps. 2013
2. KBpedia