![In the Bohr model of the atom, electrons travel in defined circular orbits around the nucleus. The …[Credits : Encyclopædia Britannica, Inc.]](http://media-2.web.britannica.com/eb-media/33/6033-004-162F0D99.gif)
In the Bohr model of the atom, electrons travel in defined circular orbits around the nucleus. The orbits are labeled by an integer, the quantum number n. Electrons can jump from one orbit to another by emitting or absorbing energy. The inset shows an electron jumping from orbit n=3 to orbit n=2, emitting a photon of red light with an energy of 1.89 eV.
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