LIMITATIONS OF MENDELEEVS CLASSIFICATION:-
- No fixed position can be given to hydrogen in the Periodic table.
- Isotopes were discovered long after Mendeléev had proposed his periodic classification of elements. Position of isotopes could not be explained.
- Another problem was that the atomic masses do not increase in a regular manner in going from one element to the next. So it was not possible to predict how many elements could be discovered between two elements.