Suboxide

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Suboxides are a class of oxides wherein the electropositive element is in excess relative to the “normal” oxides. When the electropositive element is a metal, the compounds are sometimes referred to as “metal-rich”. Thus the normal oxide of caesium is Cs2O, which is described as a Cs+ salt of O2−.

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

Image: Axiosaurus, Public domain, via Wikimedia Commons.