Question

Explain the demerits of Mendeleev's Table associated with: atomic masses of Co and Ni.​

Answer 1

Answer:

Demerits of Mendeleev's Table are :

Explanation:

(I) no fixed position could be given to hydrogen which resembles alkali metals and halogens in the periodic table.

(ii)Isotopes have different atomic masses but same chemical properties. Based on chemical properties, they were to be placed in same group, while based on atomic masses, they were used to be placed in different groups . Hence, there was no definite place for isotopes.

(iii)In certain places, elements with higher atomic mass were placed before elements of lower mass e.g. Co (At. Mass 58.93) was placed before Ni (At. Mass 58.71)

(iv)Some elements with different properties were placed in the same group. e.g. (Mn) Manganese was placed with halogens which totally differ in properties.

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