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atomic number 91 (0 synonym found)
Definition of atomic number 91:
(n) :
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
Definition of atomic number 91:
(n) :
a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
A make the world a better place giveback project.
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