Question

why the ionic charecter of FeCl2 is more than ZnCl2??

whoes ionic charecter is more out of NaCl and MgCl2??

EXPLAIN PROPERLY

Answer 1

Well According to Fajans law the cation with the higher charge will tend to show more Covalent character than the one with low charge , i know the law basically sees the ratio of charge isto size but here the charge dominates to a larger extent , therefore we can directly say NaCl is more covalent than MgCl2 .Another possible explanation is the Electronegative Difference , the electronegative difference increase means increase in the Ionic character and thus having higher electronegative difference NaCl can be said to have higher ionic character than MgCl2

Answer 2

the concept involved is of polarisation.
according to fajans rule . the cation tries to distort the geometry of anion ; like you can consider a balloon of anion and a balloon (shorter) of cation .. so you can clearly imagine that shorter the cation balloon.. greater will be the distortion!
and we know that distortion is directly proportional to polarisation which is inversly proportional to ionic character.
So while solving the questions you just have to remember one thing that cation which will have greater size will have greater ionic character.
since Fe is bigger than Zn .. therefore more ionic.
And since Na is bigger than Mg therefore NaCl is more ionic.
hope it helps..
I have tried my best .