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ICSE Class 9 Chemistry Question 8 of 20

The Periodic Table — Question 12

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Question

Question 11

State the merits of Mendeleev's classification of elements.

Answer

Merits of Mendeleev’s classification of elements:

  1. Grouping of elements: He generalized the study of the elements then known to a study of mere eight groups.
  2. Gaps of undiscovered elements: Mendeleev left some gaps in his periodic table for subsequent inclusion of elements not known at that time.
  3. Prediction of properties of undiscovered elements: He predicted the properties of then unknown elements on the basis of the properties of elements lying adjacent to the vacant slots.
  4. Incorrect atomic mass corrected: He was able to correct the atomic mass of elements like gold and platinum by placing these elements strictly on the basis of similarities in their properties.