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atomic number 21 (0 synonym found)
Definition of atomic number 21:
(n) :
a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the scandinavian mineral thortveitite
Definition of atomic number 21:
(n) :
a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the scandinavian mineral thortveitite
A make the world a better place giveback project.
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