Question

Limitations of mendeleeves classification

Answer 1

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★★LIMITATIONS-OF-MENDELEEV'S
-CLASSIFICATION★★

1) In his periodic table , no fixed position could be assigned to hydrogen.

2) The position of isotopes could not be explained in his classification as there was no space left for the isotopes.

3) Similar elements in different groups and some elements with similar properties have been placed in different groups were placed.

4) Why the elements of same group show resemblance in their properties was not explained that is 'Cause of periodicity'.

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Answer 2

Limitations of mendeleev’s classification :

(i) He could not assign a correct position of hydrogen in his periodic table, as the properties of hydrogen resembles both with alkali metals as well as with halogens.

(ii) The isotopes of the same element will be given different position if atomic number is taken as basis, which will disturb the symmetry of the periodic table.

(iii) The atomic masses do not increases in a regular manner in going from one elements to the next.

So it was not possible to predict how many elements could be discovered between two elements.