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English noun: atomic number 2

1. atomic number 2 (substance) a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)


SynonymsHe, helium


Broader (hypernym)argonon, chemical element, element, inert gas, noble gas









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