Unpaired electron

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Notion

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Science and technology

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What Wikipedia says

In chemistry, an unpaired electron is an electron that occupies an orbital of an atom singly, rather than as part of an electron pair. Each atomic orbital of an atom (specified by the three quantum numbers n, l and m) has a capacity to contain two electrons (electron pair) with opposite spins.

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

Image: KES47, Public domain, via Wikimedia Commons.