Question

Select the limitations of Mendeleev's periodic table from the given options.

• A. Some elements with different properties were kept in the same group.
• B. The position of Hydrogen was not fixed.
• C. The arrangement of elements on the basis of increasing atomic masses was not always followed.
• D. Empty spaces were left in the Mendeleev's periodic table in case some new elements were discovered.

Answer 1

Answer: (A), (B), (C)

The correct options are
A

Some elements with different properties were kept in the same group.

B

The position of Hydrogen was not fixed.

C

The arrangement of elements on the basis of increasing atomic masses was not always followed.

The limitations of the Mendeleev's periodic table are:

• the arrangement of elements on the basis of increasing atomic masses was not always followed.
• the position of hydrogen was not fixed.
• some elements with different properties were kept in the same group.

An important merit of Mendeleev's periodic table is that he kept three vacant places for the elements which were not discovered till then. Later on, these elements were discovered and named as scandium (Sc), gallium (Ga) and germanium (Ge) respectively.