Question

write demerits of mendeleev's
periodic table​

Answer 1

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.

Answer 2

Answer:

here is your answer

Explanation:

The demerits of the periodic table given by Mendeleev are :

He could not place the element Hydrogen in an an an appropriate position in the periodic tabular form.

There was no regular trend in increasing atomic mass when moved along the elements.

More elements were yet to be known.

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 subgroup as manganese (Mn) was placed with halogens which had totally different properties...