English dictionary atomic number 85 meaning and definition Definition and meaning of atomic number 85 at MeaningMonkey.org. atomic number 85 meaning and definition in the English Dictionary. ATOMIC NUMBER 85 nounDefinition of atomic number 85 (noun)a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thoriumsynonyms: astatine, At Source: Princeton University Wordnet
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