Definition of atomic number 20
English to English noun - a white metallic element that burns with a brilliant light; the fifth most abundant element in the earth's crust; an important component of most plants and animals
source: WordNet 3.0
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atomic number 20, atomic number 2, atomic number 42, atomic number 26, atomic number 32, atomic number 50, atomic number 29, atomic number 40, atomic number 27, atomic number 90, atomic number 92, atomic number 21, atomic number 70, atomic number 82, atomic number 22, atomic number 23, atomic number 10, atomic number 52, atomic number 80, atomic number 28
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