Question

E. Answer the following questions.
1. What were the notable contributions made by
Döbereiner, Newland and Mendeleev towards the
development of the Periodic Table? Why did their
laws fail?​

Answer 1

Answer: Dobereiner, Newlands and Mendeleeff were not 100% successful in their classification of elements because they were trying to classify the elements based on the atomic mass of the element. But not the atomic mass, atomic number of the element is the fundamental quantity so they all failed. Modern table was successful as the classification was done on the based of atomic number.

Explanation: