State the merits of Mendeleev's classification of elements.

Explanation

Merits of Mendeleev.s classification of elements were:
(a) Grouping of elements : He arranged the elements known then, in order of eight groups.
(b) Gaps for undiscovered elements : Mendeleev.s left some gaps in his periodic table for succeeding addition of elements with similar properties which were unknown at that time.
(c) Prediction of the properties of undiscovered elements: He predicted the properties of elements lying adjacent to vacant slots (eka -Aluminum & eka - Silicon).
(d) Incorrect atomic mass corrected : He corrected the atomic mass of elements like gold and platinum and placed them strictly on the basis of their properties.