What amongst the following is not the limitation of the Mendeleev periodic table?

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Position of Isotopes

Position of Hydrogen

Cause of periodicity

Systematic study of elements

answer is D.

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Detailed Solution

Concept- The basis of Mendeleev's periodic table is the atomic weight.
The Mendeleev periodic table has vertical columns known as groups and horizontal rows known as periods. Mendeleev arranged 63 elements in this table, which had 8 groups and 7 periods. Now, the limitations of Mendeleev's Periodic Table are
● The position of hydrogen in the periodic table was incorrectly defined.
● The increasing order of atomic masses was not followed in a certain pair of elements.
● Some similar elements were separated and dissimilar elements were grouped together in the periodic table.
● Mendeleev was unable to explain the cause of periodicity among the elements.
Thus, systematic study of elements is not the limitation of Mendeleev periodic table.
Hence, the correct answer is 4.

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