Question

Any two disadvantage of mendeleev's periodic table.

Answer 1

Answer:

•He was unable to locate hydrogen in the periodic table.

•Increase in atomic mass was not regular while moving from one element to another

• isotopes of elements were found which violated Mendeleev's periodic law.

Answer 2

Answer:

1. Elements with large differences in properties were included in the same group. ...

2. No proper position could be given to the element hydrogen.