Definition of atomic number 91 Atomic number 91
We found 1 definitions of atomic number 91 from 1 different sources.
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What does atomic number 91 mean?
WordNet
Noun |
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| atomic number 91 - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead | ||
| protactinium, protoactinium, Pa | ||
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