Question

What was wrong with the classification by Mendeleev?

Answer 1

Explanation:

1. In 1869, Russian scientist Dimitri Ivanovic Mendeleev organized all 63 elements known at the time in increasing order of their atomic weights.
2. Elements with similar properties were grouped one after the other.
3. He also noticed that elements with similar properties appeared in a predictable pattern. This is referred to as the periodicity of elements.

The limitations of Mendeleev’s classification of the elements are as follows:

1. Failed to explain the position of isotopes.
2. Wrong order of atomic masses of some elements could not be explained.
3. A position for hydrogen could not be linked to the element classification since they are irrelevant to the characteristics of the elements.
4. The atomic weights could not be linked to the element classification since they are irrelevant to the characteristics of the elements.
5. The electron arrangement could not be explained. Etc.