Why cant we write Mg+O2==>MgO+O like as the O3 reacts to form O2 and O

1.	Why cant we write Mg+O2==>MgO+O like as the O3 reacts to form O2 and O
Answer» Why cant we write Mg+O2==>MgO+O like as the O3 reacts to form O2 and O

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