# electron shell

> principal energy levels in atomic physics

**Wikidata**: [Q193793](https://www.wikidata.org/wiki/Q193793)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Electron_shell)  
**Source**: https://4ort.xyz/entity/electron-shell


## References

1. Freebase Data Dumps. 2013
2. Quora
3. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)