How did quantum mechanics change the bohr model of the atom?
Quantum mechanics predicted the Bohr atomic model by showing the orbitals of electrons and how they emit energy on jumping from their excited state to another.
By Rutherford's satement that Electrons revolved around the atom, it was shown by angular momentum that they revolve around the nucleus in a specific orbit, according to Max Planck.
But there were some exceptions. Bohr model was only applicable to Hydrogen atom, and it became complex for any other atoms of a specific element and failed to explain chemical bonds. IT also failed to explain the double spectral lines seen in the case of Hydrogen.
Even though with these exceptions, Bohr atomic model gives the simple idea of how atom looks and has been successfully applied in electronic configuration of atoms of all the elements of the periodic table.