Curium(III) oxide

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What Wikipedia says

Curium(III) oxide is a compound composed of curium and oxygen with the chemical formula Cm2O3. It is a crystalline solid with a unit cell that contains two curium atoms and three oxygen atoms. The simplest synthesis equation involves the reaction of curium(III) metal with O2−: 2 Cm3+ + 3 O2− ---> Cm2O3.

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

Image: Orci, CC BY-SA 3.0, via Wikimedia Commons.