English dictionary
atomic number 91 meaning and definition
Definition and meaning of atomic number 91 at MeaningMonkey.org. atomic number 91 meaning and definition in the English Dictionary.ATOMIC NUMBER 91 noun
Definition of atomic number 91 (noun)
- a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
- synonyms: Pa, protactinium, protoactinium
Source: Princeton University Wordnet