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What is the major demerit of Mendeleev's periodic table?

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Placement of Noble gases in the periodic table

Arrangement of elements according to their valence shell electronic configuration.

Placement of transition in the periodic table

No definite position for isotopes of all the elements.

answer is D.

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Detailed Solution

isotopes of all elements posed a challenge to Mendeleev’s Periodic Law. As elements were arranged according to the increasing order of atomic masses, different positions were required to place the isotopes of all elements.

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