Question

mendeleev periodic table merits and demerits​

Answer 1

Answer:

Merits

• Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.

Demerits

• 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.
• Later on, isotopes of elements were found which violated Mendeleev’s periodic law.

Answer 2

Explanation:

Merit

He left gap for elements to be discovered latter on

like Aluminium , silicon

demerit

sorry I don't know