Valence electron

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What Wikipedia says

In chemistry and physics, valence electrons are electrons in the outermost shell of an atom, and they can participate in the formation of a chemical bond if the outermost shell is not closed. In a single covalent bond, a shared pair forms with both atoms in the bond each contributing one valence electron.

Excerpt from the Wikipedia article “Valence electron”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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