Vanadium(IV) oxide

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Vanadium(IV) oxide or vanadium dioxide is an inorganic compound with the formula VO2. It is a dark blue solid. Vanadium(IV) dioxide is amphoteric, dissolving in non-oxidising acids to give the blue vanadyl ion, [VO]2+ and in alkali to give the brown [V4O9]2− ion, or at high pH [VO4]4−.

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

Image: Ding-Shyue Yang, Peter Baum, and Ahmed H. Zewail, CC BY 4.0, via Wikimedia Commons.