merit of mendeleeve periodic table

1.	merit of mendeleeve periodic table
Answer» 1. He generalized the study of the elements then known as the study of a mere groups.2. In Mendeleev’s periodic table, he left some blank spaces. These vacant spaces were left for including elements that were not discovered at that time.3. Mendeleev could also predict the properties of these unknown elements, on the basis of the properties of the elements lying adjacent to these vacant spaces. He placed hydrogen without any explaination and he did not leave space for isotopes and he kept high reactive metal before less reactive metal.

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