English dictionary atomic number 5 meaning and definition Definition and meaning of atomic number 5 at MeaningMonkey.org. atomic number 5 meaning and definition in the English Dictionary. ATOMIC NUMBER 5 nounDefinition of atomic number 5 (noun)a trivalent metalloid element; occurs both in a hard black crystal and in the form of a yellow or brown powdersynonyms: B, boron Source: Princeton University Wordnet
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