The ions N3−, O2−, F−, and Na+ are isoelectronic with one another.
(a) Rank these four ions in order of increasing ionic radius.
Write your answer in the form: smallest < \dots < largest.
(b) Explain how the magnitude of the nuclear charge influences the relative sizes of isoelectronic ions.
(c) Predict whether the ionic radius of Mg2+ would be larger or smaller than that of Na+, and justify your prediction.