Merit and dmerit of mendeleve periodic table

1.	Merit and dmerit of mendeleve periodic table
Answer» Merits\tSome gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group.Demerits\tHe was unable to locate hydrogen in the periodic table.\tIncrease in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable.\tLater on, isotopes of elements were found which violated Mendeleev’s periodic law.

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