Information about four isoelectronic ions is shown in the table below.

Ion	Number of protons	Number of electrons	Electron configuration
\(\text{O}^{2-}\)	\(8\)	\(10\)	\(1s^2 2s^2 2p^6\)
\(\text{F}^-\)	\(9\)	\(10\)	\(1s^2 2s^2 2p^6\)
\(\text{Na}^+\)	\(11\)	\(10\)	\(1s^2 2s^2 2p^6\)
\(\text{Mg}^{2+}\)	\(12\)	\(10\)	\(1s^2 2s^2 2p^6\)

Which of the following lists the ions in order of decreasing ionic radius and provides the correct explanation for the trend?