Question

. List the Merits of Mendeleev’s classification of elements. 8. List the Demerits of Mendeleev’s classification of elements

Answer 1

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

Explanation:

Merits:

1.he left gap for elements that are to be discovered later.

2.he predicted properties of these unknown elements .

3.he classified all the known 63 elements at a time.