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What are the limitations of Bohr's theor...

What are the limitations of Bohr's theory of hydrogen atom?

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Limitations of Bohr's theory of Hydrogen atom :
1) This theory is applicable only to simplest atom like hydrogen, with z = 1. The theory fails in case of atoms of other elements for which `z gt 1`.
2) The theory does not explain why orbits of electrons are taken as circular, while elliptlical orbits are also possible.
3) Bohr's theory does not say anything about the relative intensities of spectral lines.
4) Bohr's theory does not take into account the wave properties of electrons:
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