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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.
You can remember tell when an atom is in it's excited state when in the electron configuration, there is a huge jump, like 1s2,2s2, 2p5, 3s2. This might have happened due to being exposed to heat and or electricity. In other words, ground state=normal, excited is, well, excited.