This video lecture from Periodic Classification of Elements and Periodicity (F.Sc. second year Chemistry) covers: The blocks in the periodic table. s,p,d and f blocks and the relationship with valence electrons. Definition of metals and the classification of periodic table as metals ,nonmetals and metalloids (intermediate). 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.