Question

explain briefly meril and demerits of mendeleev periodic table​

Answer 1

Explanation:

Merits of Mendeleev's Periodic Table:

⋅ Mendeleev was first to properly arrange and classify all elements and was able to explain the periodicity in their chemical properties.

⋅ Mendeleev left some gaps for undiscovered elements. He predicted that some elements would be discovered in future. He also predicted properties of those undiscovered elements.

Demerits of Mendeleev's Periodic Table:

⋅ Position of hydrogen was not justified.

⋅ Increasing order of atomic mass could not be maintained throughout the table.

⋅ There is no place for isotopes.

Hope this will help!!!

Answer 2

There were many vacant spaces in Mendeleev's periodic table for the elements to be discovered. He named them Eka-Boron, Eka-Aluminium and Eka-silicone He also predicted the properties of these undiscovered elements including atomic masses. Mendeleev's arrangement helped to correct atomic masses of a number of elements.