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Q.
Which of the following ions has the smallest radius?
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Solution:
On moving along a period, ionic radii decreases while on moving down a group, ionic radii increases. Since, $ T{{i}^{2+}} $ and $ Z{{n}^{2+}} $ belong to IV B group and $ N{{i}^{2+}} $ and $ P{{t}^{2+}} $ belong to VIII group, ionic radii of $ T{{i}^{2+}}