In the reaction; 2Mg(s) + O2(g) ------> 2MgO(s), Mg represents the reagent magnesium.
The term chemical reaction has to do with the interaction between compounds which are called reactants to yield a new compound which is called the product.
In the reaction; 2Mg(s) + O2(g) ------> 2MgO(s), Mg represents the reagent magnesium.
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