This video lecture from Chemical Bonding (F.Sc. First Year Chemistry) covers the factors on which the bond strength depends, how electronegativity imparts the ionic character to the bond. A detailed example of HCl bond has been discussed and energy changes are illustrated. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.