Tin(II) oxide

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Tin(II) oxide (stannous oxide) is a compound with the formula SnO. It is composed of tin and oxygen where tin has the oxidation state of +2. There are two forms, a stable blue-black form and a metastable red form.

Excerpt from the Wikipedia article “Tin(II) oxide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Hubertus Giefers, Public domain, via Wikimedia Commons.