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""(92)U^(238) undergoes alpha-decay givi...

`""_(92)U^(238)` undergoes `alpha`-decay giving rise to thorium. What is the mass number of the daughter nuclide ?

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`._92U^238 overset(alpha- "decay")to ._90X^234 + ._2He^4+Q` (energy )
Hence mass number of daughter nucleus s = 234.
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