What is the balanced chemical equation for the reaction of magnesium with oxygen?
Mg+O→MgO\text{Mg} + \text{O} \rightarrow \text{MgO}Mg+O→MgO
Mg+O2→MgO2\text{Mg} + \text{O}_2 \rightarrow \text{MgO}_2Mg+O2→MgO2
2Mg+O2→2MgO2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}2Mg+O2→2MgO
Mg2+2O→2MgO\text{Mg}_2 + 2\text{O} \rightarrow 2\text{MgO}Mg2+2O→2MgO