For the isoelectronic species , and , which of the following represents the CORRECT order of their i — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

These are isoelectronic species with 10 electrons each. For isoelectronic species, the radius is inversely proportional to the atomic number $Z$. The atomic numbers are $N (7)$, $O (8)$, and $F (9)$. The lowest $Z$ exerts the weakest nuclear pull, making $N^{3-}$ the largest. Thus, $N^{3-} > O^{2-} > F^-$.