What were the main demerits of Mendeleev’s periodic table? …

Chemistry Classification of Elements and Periodicity Statement Based Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

What were the main demerits of Mendeleev’s periodic table?

(i) Hydrogen has been placed in group I though it resembled to group VII as well.

(ii) Position of some elements was not justified.

(iii) Isotopes were not given separate places.

(iv) Lanthanides and actinides ware not included in the table.

(i), (ii) and (iii)

(i), (ii), (iii) and (iv)

(ii) and (iv)

(i), (iii) and (iv)

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The correct answer is:

All are the demerits of Mendeleev’s periodic table.

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