Octet Definition

Chemistry Glossary Definition of Octet

This is a diagram of the valence electron of a neon atom, which has a complete octet.
This is a diagram of the valence electron of a neon atom, which has a complete octet. MEHAU KULYK / Getty Images

Octet Definition

In chemistry, an octet is a group of eight valence electrons surrounding an atom. All noble gases have an octet of valence electrons, with the exception of helium.

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Helmenstine, Anne Marie, Ph.D. "Octet Definition." ThoughtCo, Aug. 1, 2016, thoughtco.com/definition-of-octet-604587. Helmenstine, Anne Marie, Ph.D. (2016, August 1). Octet Definition. Retrieved from https://www.thoughtco.com/definition-of-octet-604587 Helmenstine, Anne Marie, Ph.D. "Octet Definition." ThoughtCo. https://www.thoughtco.com/definition-of-octet-604587 (accessed January 19, 2018).