Bohr Model of atom:             Neil Bohr in 1913 put forward a theory to develop atomic model and to overcome shortcomings of Rutherford model. Bohr theory has following postulates. Electrons revolve around the nucleus in fixed orbits (i.e. orbits of particular radii). Each orbit or shell is associated with a definite amount of energy. ElectronsBohr Model of Atom – Class 11 Chemistry Chapter 2 Notes