Question

One of the major demerits of Mendeleev’s Periodic Table is:

• A. He arranged the known elements in the order of their increasing atomic number
• B. Mendeleev's periodic table was unable to locate hydrogen in the periodic table
• C. It helped in predicting the discovery of new elements.
• D. None of the above

Answer 1

The correct option is B Mendeleev's periodic table was unable to locate hydrogen in the periodic table

Mendeleev arranged elements in the order of their atomic masses.
Mendeleev's table was unable to locate the correct position of Hydrogen in its periodic table since it resembled alkali metals as well as halogens.