The ionic radii of F and O respectively are 1.33 A and 1.4 A, while the covalent radius of N is 0.74 A. The correct statement for the ionic radius of N is:

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Strategy:
 For isoelectronic species, the size is determined by the nuclear charge (). The species with the lowest  will have the largest radius.

Step 1: Identify the isoelectronic set
Nitride (, ), Oxide (, ), and Fluoride (, ) all have 10 electrons.

Step 2: Relate Z to size
Since all three ions have the same number of electrons but Nitrogen has the fewest protons (), its nucleus exerts the weakest pull, making  the largest.
Order: .

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