Word:

Protactinium

1.The radioactive chemical element, of atomic number 91; Atomic symbol Pa; at. wt. of longest-lived isotope, 231 (T½ = 32,500 yrs.) Also called brevium, Uranium X2 and UX2.
Noun1.protactinium - a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead
atomic number 91, metal, metallic element, Pa, protoactinium
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-- Protactinium --
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