Which of the following particles is emitted in the reaction $_{13}Al^{27} + _{2}He^{4} \to _{15}P^{30} + .....$?

In the transformation of ${}_{92}^{238}U$ to ${}_{92}^{234}U$,if one emission is an $\alpha$-particle,what should be the other emission$(s)$?

In the nuclear equation $_{11}Na^{23} + _{1}H^{1} \to _{12}Mg^{23} + x$,what does $x$ represent?

In the nuclear reaction $_{92}U^{238} \to _{82}Pb^{206} + x\,_{2}He^{4} + y\,_{-1}\beta^{0}$,the values of $x$ and $y$ are respectively......

Which particle can be used to change $_{13}Al^{27}$ into $_{15}P^{30}$?

$_{89}Ac^{231}$ gives $_{82}Pb^{207}$ after the emission of some $\alpha$ and $\beta$ particles. The number of such $\alpha$ and $\beta$ particles are respectively: