In this study, we have looked the periodic table from the Barut’s point of view and discussed the deviations from the Madelung rule. Expected, observed and computed total energies (Hartree-Fock and Gaussian) are given for two different (one for expected and the other one is observed) configurations of the Cr atom. The data shows that preferred electronic configuration for the Cr is 4s13d5 not 4s23d4 as dictated by the Madelung rule. This event may be due to the spin correlation effect which is closely related to the Hund’s rule.