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atomic number 91
Noun
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
synonym
Pa
protactinium
protoactinium
hypernym
metal
metallic element
atomic number 91 vs Pa
atomic number 91 vs metal
atomic number 91 vs metallic element
atomic number 91 vs protactinium
atomic number 91 vs protoactinium
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