Question

Demerits of Mendeleev's Periodic table???


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Answer 1

Answer:

Demerits are...

1. He was not able to give proper place to hydrogen
2. he have not followed increasing mass concept at some places
3. He was not able to give proper place to the isotopes after their discovery.

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Answer 2

ANSWER

Demerits of Mendeleev's Periodic Table :

(a) Mendeleev arranged elements in the ascending order of their atomic masses. There was no fixed position for hydrogen in his periodic table, as it resembled alkali metals as well as halogens.

(b) Elements of higher atomic mass were placed before elements of lower atomic mass. Cobalt with atomic mass 58.93 was placed before nickel with atomic mass 58.71.

(c) Elements having different properties were placed in the same sub group like manganese (Mn) was placed with halogens which had totally different properties

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