Question

give three limitation of medeelev's classfication of element?​

Answer 1

Answer:

i) Mendeleev's periodic law could not explain the position of isotopes in the periodic table. ii) Mendeleev's periodic law could not assign a proper position to the element hydrogen in the periodic table.

iii) Mendeleev's periodic law failed to explain the wrong order of atomic masses of some elements

Answer 2

Answer:

Limitations of Mendeleev's periodic classification

1) Incorrect order of atomic masses of few elements- He arranged the elements in order of increasing atomic masses, but at a number of places in his table, this order wasn't followed

eg- Aluminium (29.98) was placed before Silicon(28.09)

2) No position for hydrogen- He couldn't assign the position of hydrogen as it resembles with both alkali metals and halogens

3) Position of Isotopes- Isotopes are placed in same position even though they have different atomic masses.