Question

What are the disadvantages of mendeleev periodic table?

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.

Answer 2

he cannot arrange the all elements in order

And he could not put all the elements in periodic table

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