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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.
Freebase(0.00 / 0 votes)Rate this definition: Electronegativity. Electronegativity, symbol Ï, is a chemical property that describes the tendency of an atom or a functional group to attract electrons towards itself. An atom's electronegativity is affected by both its atomic number and the distance that its valence electrons reside from the charged nucleus.