<P> In chemistry, an oxidizing agent (oxidant, oxidizer) is a substance that has the ability to oxidize other substances (cause them to lose electrons). Common oxidizing agents are oxygen, hydrogen peroxide and the halogens . </P> <P> In one sense, an oxidizing agent is a chemical species that undergoes a chemical reaction that removes one or more electrons from another atom . In that sense, it is one component in an oxidation--reduction (redox) reaction . In the second sense, an oxidizing agent is a chemical species that transfers electronegative atoms, usually oxygen, to a substrate . Combustion, many explosives, and organic redox reactions involve atom - transfer reactions . </P> <P> Electron acceptors participate in electron - transfer reactions . In this context, the oxidizing agent is called an electron acceptor and the reducing agent is called an electron donor . A classic oxidizing agent is the ferrocenium ion Fe (C 5H 5) + 2, which accepts an electron to form Fe (C H). One of the strongest acceptors commercially available is "Magic blue", the radical cation derived from N (C H - 4 - Br). </P>

Name a solid that is an oxidizing agent