Question

Arrange the following in increasing order of covalent character.
$NaCl,MgC{l}_2,AlC{l}_3$

Answer 1

According to Fajan's rule, the size of cation decreases, covalent character increases.
$\text{The order of size is}:N{a}^{+}>M{g}^{2+}>A{l}^{3+}$