Perbromate

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What Wikipedia says

In chemistry, the perbromate ion is the anion with the chemical formula BrO4−. It is an oxyanion of bromine, the conjugate base of perbromic acid, in which bromine has the oxidation state +7. Unlike its chlorine (ClO4−) and iodine (IO4−) analogs, it is difficult to synthesize. It has tetrahedral molecular geometry.

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

Image: Benjah-bmm27, Public domain, via Wikimedia Commons.