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Bohr’s Model of an Atom

Niels Bohr (1913) proposed a modified model of atomic structure in order to overcome the difficulties of Rutherford’s model which is the first step towards Modern Atomic Theory.


The postulates of this theory are:

1. Electrons revolve around the nucleus in a limited number of orbits called permissible orbits.
 

2. Each of these fixed orbits has a definite energy, hence they are also known as energy levels, energy shells or stationary states.
 

3. The energy of an electron remains constant so long as it stays in a given orbit. Electrons present in different orbits have different energies.
 

4. When an electron jumps from a lower energy level to a higher one, some energy is absorbed.
 

When an electron jumps from a higher energy level to a lower energy level, some energy is emitted.

The amount of energy absorbed or emitted is given by the difference of energies associated with the two levels.

Energy absorbed or emitted, D E = E2 – E1 = h n
Where h is Planck’s constant and n is the frequency of radiation absorbed or emitted.


Different Energy
 

 




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