Question

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what are merits and demerits of mendeleev's periodic table​

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.

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Answer 2

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