Physics - Modern Physics Question with Solution | TestHub

\begin{array}{l} { }_{Z}^{A} X \rightarrow_{2}^{4} H e+_{Z-2}^{A-2} Y \\ { }_{Z-2}^{A-4} Y \rightarrow e^{+}+{ }_{Z-3}^{A-4} Y^{\prime} \end{array} During ${\beta }^{+}$ emission. $${}_1{\mathrm{p}}^1\to {}_0^n{}^1+{\beta }^{+}$$ The proton changes into neutron. So, charge number decreases by 1 but mass number remains unchanged.