English dictionary atomic number 54 meaning and definition Definition and meaning of atomic number 54 at MeaningMonkey.org. atomic number 54 meaning and definition in the English Dictionary. ATOMIC NUMBER 54 nounDefinition of atomic number 54 (noun)a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amountssynonyms: Xe, xenon Source: Princeton University Wordnet
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