If K and L shells of an atom are full, then what would be the total number of electrons in the atom?  

 

Answer

 

Based on the Bohr-Bury scheme, we know that the maximum number of electrons that can be present in a particular energy shell of an atom is given by 2n 2 , where “n” is the number of energy shells.

 

Maximum Number of electrons in n th shell = 2n 2

 

For K shell, n =1

Maximum electrons = 2 x 1 2

         = 2 x 1 

         = 2 electrons

 

For L shell, n =2

Maximum electrons = 2 x 2 2  

         = 2 x 4 

                                 = 8 electrons

 

Total number of electrons = Number of electrons in K Shell + Number of electrons in L Shell

                                             = 2 + 8 

          = 10 electrons

 

There would be a total of 10 electrons if K and L shells are full.

  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