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Question

Which of the following is an limitation of Mendeléev’s periodic table?

A
The noble gases could be accommodated in a different group of the periodic table without disturbing the existing order.
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B
He predicted the existence of some elements that had not been discovered at that time.
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C
The position of hydrogen could not be fixed in the periodic table.
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D
62 elements were grouped based on similarity in their chemical properties.
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Solution

The correct option is C The position of hydrogen could not be fixed in the periodic table.
Few limitations of Medeleev’s periodic table are as follows:
  • The atomic masses did not increase in a regular manner in going from one element to the next.
  • The position of hydrogen could not be fixed. Just like halogens it reacts with metals and non-metals to form covalent bonds. However, its electronic configuration is similar to that of alkali metals.
  • Isotopes were discovered later. These posed another challenge Mendleev’s periodic law.

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