Question

list five merits and demerits of Mendeleev periodic law

Answer 1

Demerits of Mendeleev Periodic Table. He was unable to locate hydrogen in the periodic table. Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.

This means that when the elements are arranged in the order of their increasing atomic masses, the elements with similar properties recur at regular intervals. ... Merits of Mendeleev's periodic table : Mendeleev's periodic table was one of the greatest achievements in the development of chemistry
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