NEET 2014 Chemistry question
Which of the following orders of ionic radii is correctly represented?
Answer: (4)
Solution
Check each order against the known trends. A cation is smaller than its parent atom and an anion is larger than it. Isoelectronic ions (, , , all with 10 electrons) decrease in size as the nuclear charge increases: $O^{2-} (140\ pm) > F^- (133\ pm) >
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