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  4. The correct arrangement for the ions in the increasing order of their radii is

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Q. The correct arrangement for the ions in the increasing order of their radii is

KCETKCET 2014Classification of Elements and Periodicity in Properties

Solution:

Since, $Ca ^{2+}, K ^{+}, S ^{2-}$ have same number of electrons so they are isoelectronic ions, as we know that, the ion having greater number of proton will be smallest in size. Thus, the increasing order of ionic radii is

$Ca ^{2+} < K ^{+}< S^{2-}$