To calculate r, Bohr’s second postulate
about the angular momentum of the electron–the quantisation
condition – is used The radius of nth possible orbit thus found is
2
2
0
42
2
n
n
h
r
m
e
ε
 
 
π
 
 
=
 
 
 
  
π 
 
 
(12 7)
The total energy of the electron in the stationary states of the hydrogen
atom can be obtained by substituting the value of orbital radius in
Eq (12