The product of the reaction between magnesium and oxygen is magnesium oxide (MgO). This reaction involves the combustion of magnesium in the presence of oxygen:
2Mg(s) + O₂(g) → 2MgO(s)
During this exothermic reaction, magnesium atoms (Mg) react with oxygen molecules (O₂) to form magnesium oxide (MgO). The resulting compound, magnesium oxide, is a white, powdery substance. This reaction is commonly observed when magnesium metal undergoes combustion, such as when a magnesium ribbon burns in the presence of oxygen, producing magnesium oxide and releasing heat and light.