This video lecture from Chemical Bonding (F.Sc. First Year Chemistry) covers the concept of valence bond theory and how it tells about the bond formation, the overlapping of the half filled orbitals to make bonds, the difference between sigma and pi bond and their formation, examples of hydrogen, hydrogen floride, Florine and nitrogen molecule. 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.