Definition of atomic number 21
English to English noun - a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite
source: WordNet 3.0
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atomic number 21, atomic number 1, atomic number 2, atomic number 61, atomic number 10, atomic number 81, atomic number 41, atomic number 23, atomic number 31, atomic number 51, atomic number 71, atomic number 16, atomic number 42, atomic number 25, atomic number 12, atomic number 32, atomic number 17, atomic number 28, atomic number 18, atomic number 13
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