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The lowest energy state an atom can be at is called its ground state. When an electron in an atom has absorbed energy it is said to be in an excited state. An excited atom is unstable and tends to rearrange itself to return to its lowest energy state. When this happens, the electrons lose some or all of the excess energy by emitting light. Light is only emitted at certain frequencies, each corresponding to a particular electronic transition within the allowed states.
In the Bohr model of an atom, the electrons travel in a defined circular orbit around the nucleus of the atom.
Bohr model is a description of the structure of atoms. According to the Bohr model, the electrons that are in the atom absorb energy by jumping to higher-level energy.
The electrons will then give off the energy in the form of a piece of light. This is then referred to as the photon. The photon simply signifies the energy that the electrons had earlier absorbed but fell back to a lower energy level.
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