Question

Merit and demerits of Mendeleev's

Answer 1

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Answer 2

Demerit's of Mendaleev's Periodic table are :-

1. The position of isotope could not be explained.
2. He grouped dis-similar elements together. Ex :- Cu, Au, Ag and Na, K, Li.
3. Similar elements were seperated. Ex:- Au and Pt.
4. Position of Hydrogen has Anomolous. Hydrogen is a non-metal which was placed with metals.
5. The table has anomolous pair of elements in the same group. Ex:- Co is heavier than Nickel but it was placed before Nickel.

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