DEFFECTS OF BOHR'S ATOMIC MODEL

 DEFFECTS OF BOHR'S ATOMIC MODEL:

◉MONO-ELECTRONIC SYSTEM:

Bohr's theory can not explain the origin of the spectrum of multi electrons or poly electronic system like He, Li,Be. 

◉HIGH RESOLVING SPECTROMETER:

When a spectrum of hydrogen gas is seen through a powerful spectrometer, the original spectral lines are replaced by several very fine lines i.e, original lines are divided into other fine lines. These lines cannot be explained by Bohr's theory. 

◉THREE DIMENSIONAL MOTION OF ELECTRONS: 

Bohr suggested circular orbits of electrons around the nucleus of H-atom. But it is proved that the motion of electrons is not in a single plane but takes place in three dimensional space. 

◉ZEEMAN EFFECT:

When the excited atoms of hydrogen giving atomic emission spectrum is placed in a magnetic field, it's spectral lines further split up into closely spaced lines. This type of splitting up of spectral lines is called "Zeeman effect".Bohr's theory doesn't explain zeeman effect. 

◉STARK EFFECT:

When the excited hydrogen atom giving atomic emission spectrum is placed in a strong electric field, its spectral lines further split up into closely spaced lines. This type of splitting up of spectral lines is called " stark effect". Bohr's theory doesn't explain stark effect