This video lecture from Basic Concepts (F.Sc. First Year Chemistry) covers Definition of Molecules, its types and formation of molecules. Definition of Ions, its types and formation of ions. Cation, Anion, Molecular ion and relative Atomic Mass. 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.