br2 au3 in each pair is a better oxidizing agent under standard-state conditions
In a redox chemical process, an oxidizing agent is a material that obtains or "accepts" or "receives" an electron from a reducing agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) (called the reductant, reducer, or electron donor). Halogens (such as chlorine and fluorine), oxygen, and hydrogen peroxide are typical examples of oxidizing agents (H2O2).
The best oxidizing agent is fluorine, which also has the highest positive electrode potential value. Hydrogen peroxide, which is more potent than chlorine, chlorine dioxide, and potassium permanganate, is one of the most efficient oxidizers ever discovered. Normally, the oxidizing agent absorbs these electrons for itself, becoming reduced and acquiring electrons in the process. An electron acceptor is therefore an oxidizing agent.
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