Urdu Meanings, Pronounciation and Synonyms:
protoactinium
(Pronunciation -تلفظ سنیۓ )
US: 
Slow
Normal
Noun: protoactinium
| 1. protoactinium [ Synonyms: atomic number 91, pa, protactinium] | |
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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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