Question 6 - Past Year - 1 Mark Questions - Chapter 5 Class 10 - Periodic Classification of Elements

Last updated at April 16, 2024 by

If the atomic number of three element X, Y and Z are 3, 11 and 17 respectively. Which two elements will show similar chemical properties. Justify. Ans. X and Y will show similar chemical properties

 

Answer

Let’s look at the electronic configuration of all these elements

  • Electronic configuration of X (3): 2,1
  • Electronic configuration of Y (11): 2,8,1
  • Electronic configuration of Z (17): 2,8,7

Elements having the same number of valence electrons, will have similar chemical properties.

Since both X and Y have 1 valence electron, they have similar chemical properties.

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