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In alpha decay, why the unstable nucleus...

In alpha decay, why the unstable nucleus emits `""_(2)^(4)"He"` nucleus ? Why it does not emit four separate nucleons?

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Assertion: ""_2X^(A) undergoes 2 alpha -decay and the daughter product is ""_(z-4)Y^(A-8) Reason: In alpha -decay the mass number decreases by 4 and atomic number decreases by 2.