Active Metals Often Form a Protective Oxide Surface Film That

Active metals often form a protective oxide surface film that prevents further reaction of the metal with oxygen in the air. Which one of the following formulas for the metal oxide is not correct?

A) Al₂O₃ is aluminum oxide.
B) Fe₂O₃ is iron(III) oxide.
C) Na₂O is sodium oxide.
D) MgO₂ is magnesium oxide.
E) FeO is iron(II) oxide.

Correct Answer:

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