This video lecture from Chemical Bonding (F.Sc. First Year Chemistry) covers the Lewis concept of ionic bond and the reason why an electron is transferred from one atom to another and what energy changes occur during the process, the examples of first, second and third group ionic bonding with halogens and oxygen, the electronegativity difference and the ionic character determination from it. 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.