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Thus, in the reaction, the reductant or reducing agent loses electrons and is oxidized, and the oxidant or oxidizing agent gains electrons and is reduced. The pair of an oxidizing and reducing agent that are involved in a particular reaction is called a redox pair.he reduction potential is a measure of the tendency of the oxidizing agent to be reduced. Its value is zero for H + + e â â Â½ H 2 by definition, positive for oxidizing agents stronger than H + (e.g., +2.866 V for F 2) and negative for oxidizing agents that are weaker than H + (e.g., â0.763 V for Zn 2+).
An atom can become a positive ion, or a cation (cat-ion), when it gives away one or more electrons. An atom becomes a negative ion, or an anion (an-ion), when it gains one or â¦more electrons. Atoms that do this do not have completely filled valence shells, and are therefore reactive.