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(i) A radioactive nucleus 'A' undergoes ...

(i) A radioactive nucleus 'A' undergoes a series of decays as given below :
`A overset(alpha)rarr A_(1) overset(beta)(rarr)A_(2)overset(alpha)rarrA_(3)overset(gamma)(rarr)A_(4)`.
The mass number of atomic number of `A_(2)` are `176` and 171 respectively. Determine the mass and atomic numbers of `A_(4)` and A.
(ii) Write the basic nuclear processes underlying `beta` and `beta^(-)` decays.

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