This video lecture from Atomic Structure (F.Sc. First Year Chemistry) covers the basic postulates of the Bohr’s atomic model and their explanation, driving the expression of radius of an electron in the orbits of Hydrogen Atom. The result suggests that the radius is directly proportional to the square of n (number of shell). 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.