Find the energy of a given Bohr orbit using the equation E n = − R h c n 2 E n = − ( 1.Define an energy level in terms of the Bohr model. Salient features of Niels Bohr atomic model are: Electrons revolve around the nucleus in stable orbits without emission of radiant energy.(Figure 5.15) became interested in atomic spectra and the nature of the atom.įigure 5.15: A photograph of Neils Bohr. In 1912, Niels Bohr modified Rutherfords work and presented a planetary model where electrons move around the nucleus in distinct orbitals. Why do atoms emit light when they are exposed to an electric current? Why is the emitted light only at specific wavelengths? Why do different elements have different atomic spectra? Surely these atomic spectra must tell us something about the atoms that they came from, but what does it all mean? These were the types of questions that scientists were asking in the early 1900s when a Danish physicist named Niels Bohr This discovery generated the nuclear model. Niels Bohr provided the explanation by incorporating Max Plancks quantum theory into Rutherfords atomic model.

Sommerfeld’s model assumed the orbits of electrons to be elliptical rather than. The model was later modified by Sommerfeld due to its limitations. Bohr’s model was the first one to incorporate quantum theory. The energy levels have discrete energies associated with them. This phenomenon is really rather puzzling. Niels Bohr postulated that electrons revolve in fixed energy levels. In the last lesson, you learned that atoms of different elements produce different atomic spectra when they are struck by an electric spark or an electric current.

6 Bohr's Model Only Worked for Hydrogen.

5 Atomic Spectra Produced by Electrons Changing Energy Levels.

4 Bohr Used a Formula to Determine Allowed Energy Levels.

2 Bohr Used Atomic Spectra to Develop His Model.

Niels model