Question

${}_{90}^{234}Th$ changes to ${}_{82}^{206}Pb$ by emission of x $\alpha$- particles and y $\beta$-particles.
Match values of x and y:

Answer 1

${}_{90}^{234}Th$ changes to ${}_{82}^{206}Pb$ by emission of 7 $\alpha$- particles and 6 $\beta$-particles.
${}_{90}^{234}Th{\underset{-6\beta }{\overset{-7\alpha }{\to }}}_{82}^{206}Pb$
$x=7$ and $y=6$