In chemistry, a valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.
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a valence electron is a single electron, or one of two or more electrons in the outer shell of an atom. it is responsible for the chemical properties of the atom.
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