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A nucleus .nX^M emits one alpha particle...

A nucleus `._nX^M` emits one `alpha` particle and one `beta`-particle. What are the mass number and atomic number of the product nucleus?

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With emission of an alpha particle `(._(2)He^(4))` and a beta particle `(._(-1)e^(0))` , the product nucleus has mass number `= (m-4)` and charge number `= (n-1)`.
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