বিজোড় ইলেকট্রন সংখ্যার কোন ক্রমটি সঠিক?

$\mathrm{Mn}^{2+}(25) \rightarrow 1 \mathrm{s}^{2} ~2 \mathrm{s}^{2}~ 2 \mathrm{p}^{6} ~3 \mathrm{s}^{2} ~3 \mathrm{p}^{6} \qquad \begin{array}{c}\begin{array}{|l|l|l|l|l|}\hline \upharpoonleft & \upharpoonleft & \upharpoonleft & \upharpoonleft & \upharpoonleft \\\hline\end{array}\\ \mathrm {3d^5}\end{array}$ $\mathrm{Fe}^{2+}(26) \rightarrow 1 \mathrm{s}^{2} ~2 \mathrm{s}^{2}~ 2 \mathrm{p}^{6} ~3 \mathrm{s}^{2} ~3 \mathrm{p}^{6} \qquad \begin{array}{c}\begin{array}{|l|l|l|l|l|}\hline ~~~\upharpoonleft \downharpoonright~& \upharpoonleft & \upharpoonleft & \upharpoonleft & \upharpoonleft \\\hline\end{array}\\ \mathrm {3d^6}\end{array}$ $\mathrm{Cr}^{3+}(24) \rightarrow 1 \mathrm{s}^{2} ~2 \mathrm{s}^{2}~ 2 \mathrm{p}^{6} ~3 \mathrm{s}^{2} ~3 \mathrm{p}^{6} \qquad \begin{array}{c}\begin{array}{|l|l|l|l|l|}\hline \upharpoonleft & \upharpoonleft & \upharpoonleft & ~ & ~\\\hline\end{array}\\ \mathrm {3d^3}\end{array}$ $\therefore$ অযুগ্ম ইলেকট্রনের ক্রম: $\mathrm {Mn^{2+} > Fe^{2+} > Cr^{3+}}$