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  4. Which of the following ions, has smallest size?

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Q. Which of the following ions, has smallest size?

Punjab PMETPunjab PMET 2003Classification of Elements and Periodicity in Properties

Solution:

$ C{{a}^{2+}},\,\,C{{l}^{-}},\,\,{{S}^{2-}} $ and $ {{K}^{+}} $ are isolectronic species. In isoelectronic ions, size decrease with increasing nuclear charge. Hence, $ C{{a}^{2+}} $ ion is the smallest among these.