English dictionary atomic number 3 meaning and definition Definition and meaning of atomic number 3 at MeaningMonkey.org. atomic number 3 meaning and definition in the English Dictionary. ATOMIC NUMBER 3 nounDefinition of atomic number 3 (noun)a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several mineralssynonyms: Li, lithium Source: Princeton University Wordnet
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