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Question
State whether the following nuclear disintegration are allowed or not (star indicate an exited state). Give reason if it is not allowed.
\[\ce{^A_Z X -> ^A_{Z-2} X + ^4_2 He}\]
Solution
Nuclear disintegration is not allowed because mass number is not conserved. Emission of particles results in a 2 decrease in the atomic number but no change to the mass number, which is obviously impossible.
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