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atomic number 17 |
atomic number 18 |
atomic number 19 |
atomic number 2 |
atomic number 20 |
atomic number 21
| atomic number 22
| atomic number 23
| atomic number 24
| atomic number 25
| atomic number 26
atomic number 21
WORDNET DICTIONARY
Noun atomic number 21 has 1 sense
- atomic number 21(n = noun.substance) sc, scandium - a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite; Array is a kind of metal, metallic element
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