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Helium-4 (též helium 4, značka 4He) je těžší a mnohem běžnější izotop helia, tvoří asi 99,999 86 % helia v přírodě. Jeho jádro se skládá z 2 protonů a 2 neutronů a nazývá se částice alfa.
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4he značka atom 99 helium helia tvoří jeho alfa vesmíru vodíku he plyny izotop jádro protonů neutronů tedy nejjednodušší též
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Helium-4 | 4He | 99,9 998(2) | 1.00 | infobox |
| Helium-4 | I | I V (%) S T1/2 Z E (MeV) P 4He 99,9 998(2) 0 je stabilní s 2 neutrony | 1.00 | infobox |
| Helium-4 | related to Reference | Wikipedii | 0.60 | section |
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