atomic number 2 meaning

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atomic number 2 (noun): 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).

Definition of atomic number 2

  1. 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)

    Synonyms: helium, He

    Type of: chemical element, noble gas

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