question_answer

Which of the following configuration of ions has zero CFSE in both strong and weal ligand fields?

A)  \[{{d}^{10}}\]   

B)  \[{{d}^{8}}\]    

C)  \[{{d}^{6}}\]    

D)  \[{{d}^{4}}\]

Correct Answer: A

Solution :

When the configuration is d10, the distribution of electrons in the presence of either strong or weak field ligands is shown as The electrons entering in the \[{{t}_{2g}}\] set stabilize the complex ion by \[0.4\,\Delta \] units while that entering in higher energy, \[{{e}_{g}}\] set, destabilise the complex ion by \[0.6\,\Delta \] units. Thus, \[CFSE=(0.4\times 6)-(0.6\times 4)=0\]