English dictionary atomic number 21 meaning and definition Definition and meaning of atomic number 21 at MeaningMonkey.org. atomic number 21 meaning and definition in the English Dictionary. ATOMIC NUMBER 21 nounDefinition of atomic number 21 (noun)a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveititesynonyms: Sc, scandium Source: Princeton University Wordnet
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