This video lecture from Periodic Classification of Elements and Periodicity (F.Sc. second year Chemistry) covers: Binary compounds of group 7A with other elements. Ionic, covalent bonding type in halides and their dependence on electronegativity difference.Polymeric halides and the geometry of such compounds with examples . Polarizability in covalent bonds and trends in groups & periods. Meling and boiling points of halides. 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.