Give the merits of Mendeleev's periodic table.

Merits of Mendeleev’s periodic table :

1. Grouping of elements — He generalized the study of the elements then known to a study of mere eight groups.
2. Gaps of undiscovered elements — Mendeleev left some gaps in his periodic table for subsequent inclusion of elements not known at that time.
3. Prediction of properties of undiscovered elements — He predicted the properties of then unknown elements on the basis of the properties of elements lying adjacent to the vacant slots.
4. Incorrect atomic mass corrected — He was able to correct the atomic mass of elements like gold and platinum by placing these elements strictly on the basis of similarities in their properties.