4 Na+O2--->2 Na2O
4 K+O2--->2 K2O
4 Al+3 O2--->2 Al2O3
4 Fe+3 O2--->2 Fe2O3
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4 Na+O2--->2 Na2O
4 K+O2--->2 K2O
4 Al+3 O2--->2 Al2O3
4 Fe+3 O2--->2 Fe2O3