A student balances Mg + O₂ → MgO by writing MgO₂ on the right. What is the mistake?

ChemistryMediumHigh School (9–10)GeneralChemical Reactions › Chemical Equations

A student balances $\text{Mg} + \text{O}_2 \rightarrow \text{MgO}$ by writing $\text{MgO}_2$ on the right. What is the mistake?

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