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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.
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3he isotopes 4he two helium diproton stable protons isotope helium-4 decay earth's 2he neutrons bound nucleus emission resonance formation fermions
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Isotopes of helium | 3He | 0.0002% | 1.00 | infobox |
| Isotopes of helium | 4He | 99.9998% | 1.00 | infobox |
| Isotopes of helium | Main isotopes | .mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0… | 1.00 | infobox |
| Isotopes of helium | related to Helium-6 and helium-8 | These | 0.60 | section |
| Isotopes of helium | related to Helium-6 and helium-8 | The | 0.60 | section |
| Isotopes of helium | related to Helium-6 and helium-8 | Standard Model | 0.60 | section |
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