Ans: Modern periodic law states that, " The physical and chemical properties of elements are the periodic function of their atomic numbers."
Modern periodic table does correct the defects of Mendeleev's Periodic table. It is based on atomic number which is a more fundamental property of the atom. It removes the anomaly about the position of isotopes in the Mendeleev's periodic table. It also removes the other anomalies found in Mendeleev's periodic table like grouping of chemically dissimilar elements and separations of similar elements.