write all the postulates and draw backs of Bohr's model of atomic structure.
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The Bohr Model is very limited in terms of size. Poor spectral predictions are obtained when larger atoms are in question. It cannot predict the relative intensities of spectral lines. It does not explain the Zeeman Effect, when the spectral line is split into several components in the presence of a magnetic field.
drawbacks
1. Bohr treated electrons as particles where according to de Broglie's hypothesis, having a very low mass, electron also exhibits wave nature.
2. Bohr's model was adequate only for nucleus having only one electron e.g. Hydrogen, He+1, Li+2 etc. Bohr's model could not explain the spectra of multi-electronic atoms.
3. Bohr's model was two-dimensional where an atom is three-dimensional.
4. Using a better spectrometer, the spectra showed very fine lines. Bohr's model could not explain the origin of those fine lines. (Solved by Arthur Sommerfield who imagined electrons orbiting in different planes and having elliptical orbits.)
5. Bohr's model could not explain the effect electric field and magnetic field on spectra. (Stark effect and Zeeman effect)
6. In Bohr's equation, the momentum and position of electron, revolving around the nucleus were well defined. But, according, Heisenberg's Uncertainty principle, it is impossible to measure the position and momentum of electrons precisely. If the position is measure with maximum precision, there will be uncertainty in the value of momentum and vice versa.
postulates
he proposed, radiated from hydrogen atoms only when an electron made a transition from an outer orbit to one closer to the nucleus. ... Postulates of Bohr's atomic model are: 1. In an atom, the electrons revolve around the nucleus in certain definite circular paths called orbits, or shells.
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