Problem

Match the following two columns.

Column I	Column II
(a) After emission of one $\alpha$ and one $\beta$ particles	(p) atomic number will decrease by 3.
(b) After emission of two $\alpha$ and one $\beta$ particle	(q) atomic number will decrease by 2
(c) After emission of one $\alpha$ and two $\beta$ particles	(r) mass number will decrease by 8
(d) After emission of two $\alpha$ and two $\beta$ -particles.	(s) mass number will decrease by 4