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Define valence electrons

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User Duke
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Answer:

a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom

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User Dmitry Kuskov
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Answer:

In chemistry and physics, a valence electron is an outer shell electron 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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User Boggio
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