List of practice Questions

What are the respective numbers of $\alpha$ and $\beta$ particles emitted respectively in the following radioactive decay?
$^{200}_{90}\text{X} \rightarrow ^{168}_{80}\text{Y}$
Match List I with List II
List IList II
(A) Rn22286 → Po21884(III) α particle
(B) Bi21483 → Po21484(I) β− particle
(C) Th23490 → U23492(I) β− particle
(D) Na2211 → Na2210(II) β+ particle