English dictionary atomic number 87 meaning and definition Definition and meaning of atomic number 87 at MeaningMonkey.org. atomic number 87 meaning and definition in the English Dictionary. ATOMIC NUMBER 87 nounDefinition of atomic number 87 (noun)a radioactive element of the alkali-metal group discovered as a disintegration product of actiniumsynonyms: Fr, francium Source: Princeton University Wordnet
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