Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at “Periodic Law” ?
- The basis of classification of elements adopted was atomic masses of the elements. The elements were arranged in order of increasing atomic masses.
- Elements with similar properties were kept in a particular group in order of increasing atomic masses.
- Elements placed in a particular group (or sub group) were having same valency.
Note : Please note that when Mendeleev arranged the elements in the Periodic Table only 63 elements were known. Even noble gas or inert gas elements were adjusted at a later stage. Moreover, many groups were left in the table.