Isotopes of helium

Rarity: Uncommon

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Notion

Domain

Science and technology

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What Wikipedia says

Helium (2He) has nine known isotopes, but only helium-3 (3He) and helium-4 (4He) are stable. All radioisotopes are short-lived; the only particle-bound ones are 6He and 8He with half-lives 806.9 and 119.5 milliseconds.

Excerpt from the Wikipedia article “Isotopes of helium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia