What are the limitations of mendeleev's periodic table (explan with one sentence each)
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Position of Hydrogen => Position of hydrogen in the perodic table is Uncertain , Because hydrogen is placed in 1 A group with Alkali metals .
Position of isotopes => isotopes haven't been given separate place in perodic table .
Cause of periodicity => Mendeleev could not explain the cause of periodicity .
Separation of similar elements => some dissimilar elements have been placed together .
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