\mathrm{NaF} \rightarrow {\begin{matrix}{\mathrm{Na}}^{+}\rightarrow 1{s}^{2} 2{s}^{2} 2{p}^{6} \\ {F}^{-}\rightarrow 1{s}^{2} 2{s}^{2} 2{p}^{6}\end{matrix} Not Match
\mathrm{KBr} \rightarrow {\begin{matrix}{K}^{+}=1{s}^{2}2{s}^{2}2{p}^{6}3{s}^{2}3{p}^{6} \\ {\mathrm{Br}}^{-}=1{s}^{2}2{s}^{2}2{p}^{6}3{s}^{2}3{p}^{6}4{s}^{2}4{p}^{6}\end{matrix}
\mathrm{NaCl} \rightarrow {\begin{matrix}{\mathrm{Na}}^{+}=1{s}^{2}2{s}^{2}2{p}^{6} \\ \mathrm{Cl}=1{s}^{2}2{s}^{2}2{p}^{6}3{s}^{2}3{p}^{6}\end{matrix}
{\mathrm{CaI}}_{2}\rightarrow {\begin{matrix}{\mathrm{Ca}}^{+2}=1{s}^{2}2{s}^{2}2{p}^{6}3{s}^{2}3{p}^{6} \\ {I}^{-}=[\mathrm{Kr}]4{d}^{10}5{s}^{2}5{p}^{6}\end{matrix}