BOHR’S
ATOMIC THEORY


Main postulates of Bohr’s 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.  
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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 E_{2} to a lower energy level E_{1}.The energy is emitted in the form of light . Amount of energy released is given by: 

E
= E_{2}  E_{1}
E_{2}  E_{1}= 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, ……….. 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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