It provides useful information about the
atomic structure 6 To explain the line spectra emitted by atoms, as well as the stability
of atoms, Niel’s Bohr proposed a model for hydrogenic (single elctron)
atoms He introduced three postulates and laid the foundations of
quantum mechanics:
(a) In a hydrogen atom, an electron revolves in certain stable orbits
(called stationary orbits) without the emission of radiant energy