Question

Which of the following statement is incorrect regarding the Mendeleev's periodic table?

• A. It has made the study of elements easier and systematic.
• B. It has helped in correcting the doubtful atomic weights.
• C. It has paved the way for the discovery of new elements.
• D. Isotopes of the elements were placed at the same position in the periodic table.

Answer 1

The correct option is D Isotopes of the elements were placed at the same position in the periodic table.

Mendeleev's periodic table:

• made the study of elements easier and systematic because he was the one to arrange elements based on their atomic weights and propose the periodic law.
• helped in correcting the doubtful atomic weights. We could accurately predict the properties like atomic weight and the predictions were more accurate than the actual measurements.
• paved the way for the discovery of new elements because of the gaps proposed by Mendeleev, which he was sure would be filled later, as many elements were later discovered.

Isotopes were discovered long after Mendeleev developed the periodic table. So, there is no chance that he could place isotopes at the same position.