This Model was proposed by the scientist Niel Bohr

 

As per this Model,

  1. Electrons move around Nucleus of an atom.
    But they move in discrete orbits (specific paths).
    These orbits are called energy levels or shells.


Different Energy shells are:-

K shell, L shell, M shell and N shell .

10. bohrs model-Teachoo-01.png

Other Name of These shells are:-

 

Shell Name

Other Name

K shell

n=1

L Shell

n=2

M Shell

n=3

N Shell

n=4

 

 

  • Each energy shells have different amount of electrons and different energy level

  • Example; K shell can hold less electrons and has less energy level than the L shell and so on.

 

Shell Name

n

Number of Electrons

Energy Level

K shell

n = 1

2

Low Energy Level

L shell

n = 2

8

Medium Energy Level

M shell

n = 3

18

High Energy Level

N shell

n = 4

32

Max Energy Level

 

11. eg of bohrs model nitrogen atom-Teachoo-01.png

2.Electrons keep on revolving in the same shell. 

But they do not radiate energy while revolving in these shells (there is no loss of energy ).

 

Examples -

In text Question - Page 49 Q3

NCERT Back Exercise - Q5

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

About the Author

CA Maninder Singh's photo - Founder at Teachoo
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