What was the Mendeleev's basis of the classification of elements.?

(a) What was the basis of Mendeleev's Classification of elements ? (b) List two achievements of Mendeleev's periodic tables. (c) List any two observations which posed a challenge to Mendeleev's periodic law.

The basis of the classification of protozoa is

What was the basis of classification of elements by Lother Meyer?

Give an account of the process adopted by Mendeleev for the classification of elements. How did he arrive at ''periodic law'' ?

The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:

Basis Of Classification

(a) State the merits of Mendeleev's classification of elements. (b) Describe two anomalies of Mendeleeve's periodic classification of elements.

State Modern Periodic Law ? Why is it considered better than Mendeleev's periodic law for the classification of the elements ?