Neptunium(IV) oxide

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What Wikipedia says

Neptunium(IV) oxide or neptunium dioxide is a chemical compound with the chemical formula NpO2, composed of neptunium and oxygen. Solid neptunium(IV) oxide is one of two solid neptunium oxides, the other one being neptunium(V) oxide.

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

Image: Neptuniumagier, CC BY-SA 4.0, via Wikimedia Commons.