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Protactinium
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noun
Protactinium
n. 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.
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Collaborative International Dictionary of English 0.48
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Words linked to "Protactinium" :
protoactinium
,
metallic element
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