Rhenium trioxide

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What Wikipedia says

Rhenium trioxide or rhenium(VI) oxide is an inorganic compound with the formula ReO3. It is a red solid with a metallic lustre that resembles copper in appearance. It is the only stable trioxide of the Group 7 elements (Mn, Tc, Re).

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

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