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protactinium    
n. 镤

镤

protactinium
n 1: a short-lived radioactive metallic element formed from
uranium and disintegrating into actinium and then into lead
[synonym: {protactinium}, {protoactinium}, {Pa}, {atomic number
91}]

Protactinium \Protactinium\
The radioactive chemical element, of atomic number 91; Atomic
symbol Pa; at. wt. of longest-lived isotope, 231 (T1/2 =
32,500 yrs.) Also called brevium, Uranium X2 and UX2.
[PJC]


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