Are the following decays possible? If not, why not? a. ({ }_{90}^{232} mathrm{Th} ightarrow{ }_{92}^{236} mathrm{U}+alpha)

Are the following decays possible? If not, why not?

a. \({ }_{90}^{232} \mathrm{Th} \rightarrow{ }_{92}^{236} \mathrm{U}+\alpha\)

b. \({ }_{94}^{238} \mathrm{Pu} \rightarrow{ }_{92}^{236} \mathrm{U}+\alpha\)

c. \({ }_{15}^{33} \mathrm{P} \rightarrow{ }_{16}^{32} \mathrm{~S}+\mathrm{e}^{-}\)