CBSE Class 11-science Answered

Bohr's model for hydrogen atom:

3. When transition occurs between two stationary states that differ in energy, the frequency of the radiation absorbed or emitted can be calculated.

4. An electron can move only in those orbits for which its angular momentum is an integral multiple of h/2pi

5.  The radii of the stationary states is expressed as r_n = n²a_o where a_o= 52.9 pm

6. The energy of stationary state:

1. It failed to account for the finer details of the hydrogen spectrum. For instance, splitting of a line in the spectrum into two closely spaced lines.
2. It was also unable to explain spectrum of atoms containing more than one electron.
3. It was unable to explain Zeeman Effect i.e. splitting of spectral line in presence of magnetic effect.
4. It also failed to explain Stark effect i.e. splitting of spectral line in presence of electric field.
5. It could not explain the ability of atoms to form molecules by chemical bonds

 For more detailed information: click on the link http://www.topperlearning.com/student/video/MTAy/NTQ=/CBSE/XI/Chemistry/Structure%20of%20Atom/Spectrum