Question

(a) What was Mendeleev's basis for classification of elements ?

(b) Mendeleev's contributions to the concept of periodic table laid the foundation for the Modern Periodic Table.Give reasons.

Answer 1

(a) It is based upon Mendeleev’s Periodic Law which states that the properties of the elements are the periodic functions of their atomic weights.
(b) Mendeleev arranged the elements in such a manner that elements having similar properties occur in the same vertical column and after fixed intervals.