Number of valence electrons in Cl ion are:

(a) 16 (b) 8 (c) 17 (d) 18

 

Answer

 

(b) 8

 

Explanation:

 

  • Valence electrons are the electrons in the last filled shell of an atom.
  • Cl has atomic number 17, therefore it has 17 electrons

 

  • Cl - has 1 e - more than Cl , therefore it will have 18 electrons

 

  • Its electronic configuration is given as follows:
    K Shell = 2 e -
    L Shell = 8 e -
    M Shell = 8 e -

 

  • Since the valence shell(M Shell) has 8 e - , the number of valence electrons is 8.

 

  1. Class 9
  2. Chapter 4 Class 9 - Structure of Atom (Term 2)

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CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo