This video lecture from Atomic Structure (F.Sc. First Year Chemistry) covers the different rules of electronic contribution which include the maximum of 2 electrons in the orbital, rule for finding out the electrons in the shells, the (n+l) rule, Aufbau principle of increasing energy, Pauli’s exclusion rule of opposite spin and Hund’s rule of arranging the electrons in the separate degenerate orbitals. 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.