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A nucleus .92U^(235) undergoes alpha dec...

A nucleus `._92U^(235)` undergoes alpha decay and transforms into thorium. What is mass number and charge number of nucleus produced?

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`._92U^(235)to ._2He^4 +._(92-2)Th^(235-4)`
Mass number of Thorium=`235-4=231`
Charge number of Thorium=`92-2=90`
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