atomic number 91

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Noun1.atomic number 91 - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into leadatomic number 91 - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
protactinium, protoactinium, Pa
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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