$\begin{array}{l}A=[\mathrm{Ne}]\left[3 s^{2} 3 p^{1}\right] \\ D=[\mathrm{Ne}]\left[3 s^{2} 3 p^{5}\right]\end{array}$

$\begin{array}{l} A=n s^{1} \\ B=(n+1) s^{2}(n+1) p^{2} \\ C=(n+1) s^{2}(n+1) p^{4} \\ D=(n+2) s^{2}(n+2) p^{2} \\ E=(n+2) s^{2}(n+2) p^{5} \end{array}$

এখানে, $n=1$