The ions S^{2-}, Cl^{-}, K^{+}, Ca^{2+} are i | vedclass

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(C) For isoelectronic species,the ionic radii decrease as the nuclear charge increases.Since all these ions have the same number of electrons ($18$ el

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a significant decrease from $S^{2-}$ to $Ca^{2+}$

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(C) For isoelectronic species,the ionic radii decrease as the nuclear charge increases.Since all these ions have the same number of electrons ($18$ electrons),the ionic radius depends on the effective nuclear charge $(Z_{eff})$.As the atomic number $(Z)$ increases from $S$ $(16)$ to $Ca$ $(20)$,the nuclear charge increases,which pulls the electrons closer to the nucleus.Therefore,the ionic radii show a significant decrease from $S^{2-}$ to $Ca^{2+}$.

The ions $S^{2-}, Cl^{-}, K^{+}, Ca^{2+}$ are isoelectronic. Their ionic radii show

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