In \( \text{F}^- \), Ne, and \( \text{Na}^+ \), all have \( 1s^2, 2s^2, 2p^6 \) configuration. They differ in size due to differences in nuclear charge, affecting their pull on electrons.
20 mL of sodium iodide solution gave 4.74 g silver iodide when treated with excess of silver nitrate solution. The molarity of the sodium iodide solution is _____ M. (Nearest Integer value) (Given : Na = 23, I = 127, Ag = 108, N = 14, O = 16 g mol$^{-1}$)