The radioactive nuclei are unstable and emit alpha `(._(2)He^(4))` , beta `(._(-1)e^(0))` and gamma `(._(0)gamma^(0))` radiations to acheive states of greater stability. Rutherford and Soddy suggested the following rules governing the radioactive decay, (i) The algebric sum of charges (atomic numbers) before and after disintegration must be the same. (ii) The sum of mass numbers before and after disintegration must also be the same.
In gamma decay

Options

A. Both A and Z increases by 1
B. Both A and Z decreases by 1
C. Neither A nor Z change
D. A is always equal to Z

Explanation

As a `gamma`-ray photon has no charge and no mass, therefore, in gamma decay, neither A nor Z changes.