Why is aluminum metal unreactive with air under normal conditions?

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A It is located very low in the reactivity series.
B It is covered with a protective, unreactive layer of aluminum oxide.
C It melts at a very high temperature.
D It reacts only when it is in a liquid state.

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Answer: B. It is covered with a protective, unreactive layer of aluminum oxide.

Answer: B) It is covered with a protective, unreactive layer of aluminum oxide.
Explanation: Aluminum is actually a highly reactive metal, but it reacts immediately with oxygen in the air to form a thin, tough coating of aluminum oxide. This layer protects the metal underneath from further corrosion.

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Why is aluminum metal unreactive with air under normal conditions?

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