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excited state: state in which an atom or molecule picks up outside energy, causing an electron to move into a higher-energy orbital.
Electrons move into higher orbitals when giving energy, but shortly after, will move back to the ground state by emitting a proton. An example of an electron in an excited state is the electron of the hydrogen atom when it is in the n=2 orbital. When in the n=1 orbital, it is in the ground state. Learn more about Atoms & Molecules