What are the demerits of Mendeleev's periodic table?
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Explanation:
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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The Nobel gas elements were not included in this table as these were not discovered at that time
The larger atomic weight elements were placed before smaller atomic weight elements without any justifiable reason
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