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The isotope of ""(92)U^(238) decays by a...

The isotope of `""_(92)U^(238)` decays by `alpha`-emission to an isotope of thorium (Th). The thorium isotope decays by `beta`-emission to an isotope of protactinium (Pa). Write down the equation to represents these two nuclear charges.

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`alpha`-emission is as follows:
`""_(92) U^(238) overset(-alpha(""_(2) He^(4))) to 90 Th^(234)`
`beta`-emission :
`""_(92) Th^(234) overset((""_(-1) beta^(0))) to "(Protactinium)" ""_(93) Pa^(234)`
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