The ionic radii of isoelectronic species N^ 3- , O^ 2- and F^- are in the order? [J & K CET 2003]

JEE Main Chemistry question

The ionic radii of isoelectronic species and are in the order? [J & K CET 2003]

(A)1.36, 1.40, 1.71
(B)1.36, 1.71, 1.40
(C)1.71, 1.40, 1.36Correct
(D)1.71, 1.36, 1.40

Answer: (C)

Solution

and are isoelectronic (10 electrons each); as nuclear charge increases from N (Z=7) to O (Z=8) to F (Z=9), the same number of electrons is pulled in more tightly, so the radius

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Question ID VK-133130