Lakhmir Singh Solutions Class 10 Chemistry Solutions for Exercise in Chapter 5 - Chapter 5 Periodic Classification of Elements

Question 3 Exercise

(b) What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.


(b) The significance of atomic numbers in the periodic table is the arrangement of elements according to their electronic configuration. The elements placed in the same group show similar chemical properties.

Example: Atomic number of lithium is 3 and its electronic configuration is 2,1. It is placed in the first group as the valence electron is 1 and sodium has an electronic configuration of 2,8,1 having 1 valence electron and belongs to the same group.

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