Question

What factor decide percentage of covalent character?

Answer 1

A covalent bond is a chemical bond that involves the sharing of electron pairs between two atoms. These electron pairs are known as bonding electron pairs, and they share these electrons to form covalent bond. 

The percentage of ionic character of the bondbetween the two atoms of HBr is 100 x 0.12 = 12 percent.

Answer 2

Answer: depends predominantly on Cation Polarising power on anion.

Explanation: Mutual Sharing of electrons basically defines the Covalent Bond and every ionic bonds have some partial covalent character and vice versa.

And according to Fajans rule Smaller the size of cation and larger the size of anion favours the covalent bond.

And the main factor is the Polarising power of cation and polarisibility power of anion and the extent of distortion determines the percent of covalent character.