Urdu Meanings, Pronounciation and Synonyms:
atomic number 91
(Pronunciation -تلفظ سنیۓ )
US: 
Slow
Normal
Noun: atomic number 91
| 1. atomic number 91 [ Synonyms: pa, protactinium, protoactinium] | |
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A short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
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