In order to remove defecte in Rutherford's atomic model, Neil.Bohr in 1913 proposed a new model of hydrogen atom. Bohr was a Danish physicist. His model was based on plants quentum theory of radiations. He assumed that the electron could not have any energy rather it was restricted to a particular sat of energy values, which are better known as energy levels/ shells/ orbits . It means that the energy of electrons is fixed.