31.4 Exercise 6

Are the following reactions possible? For each, explain why or why not.

1. ${}_{92}^{238}{\text{U}} \rightarrow {}_{88}^{234}{\text{R}} \text{a} + {}_{2}^{4}{\text{H}} \text{e}$
2. ${}_{88}^{223}{\text{R}} \text{a} \rightarrow {}_{82}^{209}{\text{P}} \text{b} + {}_{6}^{14}{\text{C}}$
3. ${}_{6}^{14}{\text{C}} \rightarrow {}_{7}^{14}{\text{N}} + e^{-} + \left(\bar{v}\right)_{\text{e}}$
4. ${}_{12}^{24}{\text{M}} \text{g} \rightarrow {}_{11}^{23}{\text{N}} \text{a} + e^{+} + v_{\text{e}}$