The radioactive nv lei are unstable and emit alpha \( \left({ }_{2} \mathrm{He}^{4}\right) \), b...
0The radioactive nv lei are
unstable and emit alpha \( \left({ }_{2} \mathrm{He}^{4}\right) \), be \( \left.{ }_{{ }_{-1}} e^{0}\right) \) and gamma \( \left({ }_{0} \gamma^{0}\right) \) radiations to achieve states of greater stability. Rutherford and Soddy suggested the following rules governing the radioactive decay : (i) The algebraic 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 alpha decay
(A) mass number \( A \) decreases by 4 and atomic number \( Z \) increases by 2 .
(B) A decreases by 4 and \( Z \) decreases by 2
(C) \( A \) increases by 4 and \( Z \) decreases by 2
(D) \( A \) increases by 4 and \( Z \) increases by 2 .
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