Which among the following cations forms the m | vedclass

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(B) According to the Irving-Williams series,for the same ligand,the stability of complexes formed by divalent metal ions of the $3d$ series generally

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$Co^{2+}$

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(B) According to the Irving-Williams series,for the same ligand,the stability of complexes formed by divalent metal ions of the $3d$ series generally increases as the ionic radius decreases from $Mn^{2+}$ to $Zn^{2+}$.Among the given $3d$ transition metal ions ($Mn^{2+}$,$Fe^{2+}$,$Co^{2+}$),$Co^{2+}$ has the smallest ionic radius and the highest charge density,leading to the strongest metal-ligand interaction.$Cd^{2+}$ is a $4d$ series element and is generally not compared directly in the $3d$ series stability trend.Therefore,$Co^{2+}$ forms the most stable complex among the options provided.

Which among the following cations forms the most stable complex with the same ligand?

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