A student investigating trends in ionic crystal lattices examines the data below for four isoelectronic ions with the ground-state electron configuration \(1s^2 2s^2 2p^6\).

Ion	Number of protons	Number of electrons
\(\text{O}^{2-}\)	\(8\)	\(10\)
\(\text{F}^-\)	\(9\)	\(10\)
\(\text{Na}^+\)	\(11\)	\(10\)
\(\text{Mg}^{2+}\)	\(12\)	\(10\)

Which of the following correctly ranks the ions in order of decreasing ionic radius, and provides the best explanation for this trend?