Write the distribution of electrons in carbon and sodium atoms.

 

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.

 

(i) Carbon

Atomic number of Carbon = 6

Therefore, number of electrons in Carbon = 6

  • 2 of them are held in K Shell (as K Shell can hold max 2 electrons)
  • 4 of them are held in L Shell (as L Shell can hold max 8 electrons)


    So, 

    K Shell - 2

    L Shell - 4

 

(ii) Sodium

Atomic number of Sodium = 11

Therefore, number of electrons in Sodium = 11

  • 2 of them are held in K Shell (as K Shell can hold max 2 electrons)
  • 8 of them are held in L Shell (as L Shell can hold max 8 electrons)

Remaining 1 is held in M Shell

So, 

K Shell - 2

L Shell - 8

M Shell - 1

  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