Vi fant 1 definisjoner av atomic number 21 på engelsk.
Noun |
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| atomic number 21 - a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite | ||
| scandium, Sc | ||
| metallic element, metal any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. | ||