Question

Why licl is more covalent than kcl explain in the basis of s block?

Answer 1

Yes because kcl bond is stronger in bonding

Answer 2

$\huge\tt{Answer}$

LiCl is more covalent than KCl because This is due to a phenomenon called polarization. It causes the formation of partial covalent character in an ionic bond.

It depends upon four factors out of which two are :

1) Smaller the size of the cation, more the attraction and more the polarization.

2) Large the size of the anion, more the distortion and more the polarization. The anion here is same, Cl-, but the cation Li+ is much smaller than K+ and so more polarization occurs in LiCl, thereby making it more covalent than KCl.

But AlF3 is more ionic than AlCl3 because of the electronegativity difference between F- and Cl+ being more electronegative fluorine attract the more number of outermost electron of aluminium as compared to Cl which makes the compound more ionic.