Chemistry - Complete s-block Question with Solution | TestHub

Size of anion is${\text{I}}^{-}>\text{B}{\text{r}}^{-}>\text{C}{\text{l}}^{-}>{\text{F}}^{-}$. As the size increases, polarisation of an anion is more, hence when covalent character increases ionic character decreases.
Order of ionic character is$\text{M}\text{g}{\text{F}}_2>\text{M}\text{g}\text{C}{\text{l}}_2>\text{M}\text{g}\text{B}{\text{r}}_2>\text{M}\text{g}{\text{I}}_2$
Hence Magnesium fluoride has the highest ionic character.