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an atom by another atom , an ion , or a molecule . reduction is the gain of electrons or a decrease in the oxidation state of an atom by another atom , an ion , or a molecule . for example, during the combustion of wood, electrons are transferred from carbon atoms in the wood to oxygen atoms in the air
oxidized. and, because it donates electrons, the reducing agent is also called an electron donor . electron donors can also form charge transfer complexes with electron acceptors. reductants in chemistry are very diverse. electropositive elemental metals , such as lithium , sodium , magnesium , iron , zinc...
https://en.wikipedia.org/wiki/Redox