Physics

Problem

A nuclide

^{227}_{90}X

undergoes the following decays in the order given:

\beta^{-}

\alpha

\alpha

\beta^{-}

\gamma

\alpha

\beta^{+}

. Which of the following is the final nuclide produced? a)

^{219}_{88}\text{Ra}

^{215}_{85}\text{At}

^{215}_{86}\text{Rn}

^{215}_{84}\text{Po}