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Reducing agent | reductant | reducer. the element or compound in an oxidation-reduction reaction that donates an electron to another species. Because the reducing agent is losing electrons, we say it has been oxidized.
Best Answer: A reducing agent is something that gains electrons and causes another atom to give up its electron in a process called oxidation. To find out which metal is the best reducing agent, you have to check the reduction potential table, which can be find online. http://www.jesuitnola.org/upload/clark/R... To answer your question, Co is the best reducing agent with a high reduction potential of 1.82 V. Source(s): I'm a biochem.