The ionic radii of O, F, Na and Mg are in the order:

Strategy: For isoelectronic ions, rank them by atomic number (). A lower means a larger radius. Step 1: Tally electrons Species: . All have 10 electrons. Step 2: Order by size Order (Descending size):

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PERI-035MediumClassification of Elements and Periodicity JEE Main 2020 · Morning

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