Which of the following has the largest ionic size?
Correct answer: C. N³⁻
- A. F⁻
- B. O²⁻
- C. N³⁻
- D. Na⁺
Explanation
These ions are isoelectronic, meaning they all contain the same number of electrons. In isoelectronic species, the ionic radius is determined by nuclear charge: as the number of protons increases, the nucleus pulls the electrons more strongly, causing the ion to become smaller. Since nitrogen has the lowest nuclear charge (7 protons) among these ions, it exerts the weakest attraction on the shared electron cloud, giving it the largest ionic radius.
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