Which of the following isoelectronic ions has | vedclass

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Question

(D) All the given ions ($K^{+}$,$Cl^{-}$,$Ca^{2+}$,$S^{2-}$) are isoelectronic with $18$ electrons.Ionization energy depends on the effective nuclear

Vedclass · Accepted Answer

$S^{2-}$

Vedclass · Answer

(D) All the given ions ($K^{+}$,$Cl^{-}$,$Ca^{2+}$,$S^{2-}$) are isoelectronic with $18$ electrons.Ionization energy depends on the effective nuclear charge and the net charge on the ion.It is easier to remove an electron from a negatively charged species than from a neutral or positively charged species due to higher electron-electron repulsion and lower effective nuclear attraction.Among the given options,$S^{2-}$ has the highest negative charge,which makes it the easiest to lose an electron.Therefore,$S^{2-}$ has the lowest ionization energy.Hence,the correct option is $D$.

Which of the following isoelectronic ions has the lowest ionization energy?

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