Question

give the demerits of mendeleev's periodic table.​

Answer 1

Answer:

DEMERITS OF MENDELEEV'S PERIODIC TABLE ARE :-

★ Mendeleev could not assign a correct position to hydrogen in the period tables as hydrogen resembles alkali metals as well as halogens.

★ Isotopes had to be given the same Position in the periodic table though isotopes of the same element have different atomic masses.

★ Some elements placed in the same sub- group varies in their properties. Manganese is placed with halogens which totally differ in their properties.

★ It was observed at the certain places, an element of higher atomic mass cobalt ( Co= 58.93) has been placed over an element of lower atomic mass nickle (Ni=58.71) .

Explanation:

$\huge\color{green}hope \: helps$

Answer 2

Demerits of Mendeleev Periodic Table

• He was unable to locate hydrogen in the periodic table.

• Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.

• Later on, isotopes of elements were found which violated Mendeleev’s periodic law.

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