BOHRíS ATOMIC THEORY
 
  Main postulates of Bohrís atomic theory are:
CONSTANT ENERGY CONCEPT
 
  Energy of an electron is constant in one of its allowed orbits. As long as an electron remains in its orbit,   it neither absorbs nor radiates energy.
CONCEPT OF ENERGY LEVELS
 
  Electrons revolve around the nucleus of atom in circular orbits in which energy of electrons is constant.   These circular paths are known as "energy levels" or "stationary states".
RADIATION OF ENERGY
 
  If an electron jumps form higher energy level to a lower energy level, it radiates a definite amount of   energy.
...
ABSORPTION OF ENERGY
 
  If an electron jumps from lower energy level to a higher energy level, it absorbs a definite amount of   energy.
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AMOUNT OF ENERGY
 
  Energy released or absorbed by an electron is equal to the difference of energy of two energy levels.
  Let an electron jumps from a higher energy level E2 to a lower energy level E1.The energy is emitted in   the form of light . Amount of energy released is given by:
E = E2 - E1
E2 - E1= h
Where
h = Planck's consrant ( 6.6256 x 10-34 j.s)
= Frequency of radiant light
ANGULAR MOMENTUM OF ELECTRON
 
  Angular momentum of an electron in an energy level is given by:

m v r = nh /2

Where n =1, 2, 3, ÖÖÖ..

m = mass of electron

V = velocity of electron

r = radius of orbit

OR
  Only those energy levels or orbits are possible for which angular momentum of electron is an integral   multiple of h /2.
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