What is the basic difference in approach between the Mendeleev’s periodic law and the modern periodic law?
Mendeleev’s periodic law It states that the properties of the elements are a periodic function of their atomic weights. Modem periodic law It states that the properties of the elements are a periodic function of their atomic numbers, thus, change in the base of classification of elements from atomic weight to atomic number is the basic difference between Mendeleev s periodic law and the modern periodic law.