# helium-4

> isotope of helium

**Wikidata**: [Q1151346](https://www.wikidata.org/wiki/Q1151346)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Helium-4)  
**Source**: https://4ort.xyz/entity/helium-4


## References

1. Freebase Data Dumps. 2013
2. [NuDat](http://www.nndc.bnl.gov/nudat2/reCenter.jsp?n=2&z=2)
3. [The AME2016 atomic mass evaluation (I). Evaluation of input data; and adjustment procedures](http://amdc.in2p3.fr/masstables/Ame2016/mass16.txt)
4. [NuDat](http://www.nndc.bnl.gov/nudat2/reCenter.jsp?z=2&n=2)
5. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)