Demerits and merits of Mendeleev periodic table
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✨Demerits of Mendeleev Periodic Table. He was unable to locate hydrogen in the periodic table. Increase 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.
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merits: Some 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.
2) demerits:He was unable to locate hydrogen in the periodic table.
Increase in atomic mass was not regular while moving from one element to another. ...
Later on, isotopes of elements were found which violated Mendeleev's periodic law.
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