Concept information
Preferred term
helium
Definition
- Helium is a chemical element with the symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. There are nine known isotopes of helium, but only helium-3 and helium-4 are stable. These two isotopes, unlike those of most chemical elements, differ significantly in their properties, as the ratio of their atomic masses is large. Helium is the second lightest and second most abundant element in the observable universe (hydrogen is the lightest and most abundant). The vast majority of helium was formed by Big Bang nucleosynthesis one to three minutes after the Big Bang. (Adapted from: https://en.wikipedia.org/wiki/Helium and translated from: https://fr.wikipedia.org/wiki/H%C3%A9lium)
Broader concept
In other languages
-
French
URI
http://data.loterre.fr/ark:/67375/QX8-ZH4HVSL5-9
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