Масъала 27 аз 73

A. ${ }_{93}^{238} \mathrm{~Np} \rightarrow{ }_{+1}^{0} \mathrm{e}+{ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ B. ${ }_{91}^{231} \mathrm{~Pa} \rightarrow{ }_{2}^{4} \mathrm{He}+{ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ C. ${ }_{90}^{232} \mathrm{Th} \rightarrow{ }_{1}^{1} \mathrm{P}+{ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ D. ${ }_{94}^{244} \mathrm{Pu} \rightarrow{ }_{-1}^{0} \mathrm{e}+{ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$