Un élément chimique est une classe d'atomes dont le noyau compte un même nombre de protons.
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FR
Un élément chimique est une classe d'atomes dont le noyau compte un même nombre de protons.
Wikipedia
L'ensemble des atomes caractérisés par un certain nombre de protons dans leur noyau.
Wikipedia Disambiguation
Type d'atomes ayant le même nombre de protons dans leur noyau atomique et les mêmes propriétés chimiques, mais pas nécessairement la même masse, ni la même stabilité
Wikidata
Une substance composée d'atomes de même numéro atomique; des exemples courants sont l'hydrogène, l'or, et le fer.
OmegaWiki
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