Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at Periodic Law?

(N/A) Mendeleev examined the relationship between the atomic masses of elements and their physical and chemical properties.
Among chemical properties,he concentrated on the compounds formed by elements with oxygen and hydrogen (oxides and hydrides).
He selected these two elements because they are very reactive and formed compounds with most elements.
He wrote down the properties of each element on separate cards and grouped together elements with similar properties.
He observed that most of the elements got arranged in the periodic table in the order of increasing atomic masses.
Based on this,he formulated the Periodic Law,which states that the properties of elements are a periodic function of their atomic masses.