# principal quantum number

> one of four quantum numbers which are assigned to each electron in an atom to describe that electron's state

**Wikidata**: [Q867448](https://www.wikidata.org/wiki/Q867448)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Principal_quantum_number)  
**Source**: https://4ort.xyz/entity/principal-quantum-number


## References

1. Freebase Data Dumps. 2013
2. BabelNet
3. ISO 80000-10:2019 Quantities and units — Part 10: Atomic and nuclear physics
4. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)