Question

Write the merits and demerits of the mendeleevs periodic table​

Answer 1

Answer:

✨Advantage of Mendeleev Periodic Table :-1.He left blank Places which help scientist to discover new element 2.When Noble gasses was discovered Hel could add it to periodic table without any major changle 3.He predicted the property of new element Disadvantages :- 1. Couldn't explain position of Hydrogen 2.Couldn't answer the question "Can we have an element with atomic mass 3 between Hydrogen and Helium 3 He placed cobalt before Nickel though Cobalt has more mass..

✨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.

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Answer 2

Answer:

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

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