JEE Main 2026 — 5 April, Evening Shift — Question 66

$d^{3} \rightarrow\left[t_{2 g}^{3}, e_{g}^{0}\right], 3$ unpaired electrons $d^{4}($ low spin $) \rightarrow\left[t_{2 g}^{4}, e_{g}^{0}\right], 2$ unpaired electrons $\mathrm{d}^{5}$ (high spin) $\rightarrow\left[\mathrm{t}_{2 \mathrm{~g}}^{3}, \mathrm{e}_{\mathrm{g}}^{2}\right], 5$ unpaired electrons $d^{6}$ (high spin) $\rightarrow\left[t_{2 g}^{4}, e_{g}^{2}\right], 4$ unpaired electrons $d^{7}$ (low spin) $\rightarrow\left[t_{2 g}^{6}, e_{g}^{1}\right], 1$ unpaired electrons