This video lecture from Transition Elements (F.Sc. second year Chemistry) covers: Metallic structure and the ionic / covalent radii trend in various periods. The small atoms as interstitial impurities in bigger transition metal atoms and the change in properties caused by them. Difference in Alloys and Compounds with examples. 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.