👉 Oxidation is a chemical reaction in which an element loses one or more electrons. In other words, it changes from one form to another without changing its chemical structure. Oxidation can be applied to any substance undergoing this process, but it is most commonly used with metals and other elements that lose electrons when they are oxidized. For example, in the reaction between iron (Fe) and oxygen (O2), Fe loses an electron from its outermost shell of electrons, forming a