Chemistry

Problem

_{90}^{234}\text{Th}

undergoes the following decay sequence:

\beta^{-}

\beta^{-}

, then

\alpha

. Which isotope is produced at the end of this sequence? a)

_{92}^{234}\text{U}

_{90}^{230}\text{Th}

_{92}^{230}\text{U}

_{86}^{230}\text{Rn}