An oxidizing agent is a substance that causes another substance to be oxidized (to lose electrons).
In the diagram, oxygen is the oxidizing agent because it draws away magnesium’s valence electrons.An oxidizing agents cause other elements to lose electrons. The oxidizing agent gains the electrons lost by other elements.
While oxygen is the oxidizing agent shown in the diagram above, any element in a chemical reaction that gains electrons from another element is an oxidizing agent.
In the diagram to the right, chlorine needs an electron to complete the pairing of its valence electrons. Thus, in a chemical reaction, chlorine acts as an
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