Source: wikibot/isotopes-of-helium
= Isotopes of helium
{wiki=Isotopes_of_helium}
Helium has two stable isotopes, Helium-3 (\\(^3\\text\{He\}\\)) and Helium-4 (\\(^4\\text\{He\}\\)), and one unstable isotope, Helium-5 (\\(^5\\text\{He\}\\)). 1. **Helium-3 (\\(^3\\text\{He\}\\))**: This isotope has two protons and one neutron. It is relatively rare, constituting about 0.01% of naturally occurring helium.