Question

Mendeleev periodic table Merit and demerit explain​

Answer 1

Explanation:

Merits of Mendeleev Periodic Table

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 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.

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

Answer 2

Answer:

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.

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