English dictionary atomic number 45 meaning and definition Definition and meaning of atomic number 45 at MeaningMonkey.org. atomic number 45 meaning and definition in the English Dictionary. ATOMIC NUMBER 45 nounDefinition of atomic number 45 (noun)a white hard metallic element that is one of the platinum group and is found in platinum ores; used in alloys with platinumsynonyms: Rh, rhodium Source: Princeton University Wordnet
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