Write at least two weaknesses of Mendeleev's periodic table.
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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 .
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1. The position of hydrogen was not satisfactory
2. The isotopes were not placed in the right places
2. The isotopes were not placed in the right places
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