bn:00131525n
Noun Concept
Categories: Isotopes of helium
EN
helium-4  4He  He-4  Helium 4
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Helium-4 is a stable isotope of the element helium. Wikipedia
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EN
Helium-4 is a stable isotope of the element helium. Wikipedia
Isotope of helium Wikidata
The normal isotope of helium, 42He, that has two neutrons. Wiktionary
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