Essential Chemistry for IGCSE - Metals And Reactivity (Section 6 - No. 1)
Why does aluminum appear unreactive in many situations?
It has a high melting point.
It forms a thin layer of aluminum oxide that prevents further reaction.
It is less dense than other metals.
It does not react with oxygen.
Explanation
Aluminum forms a protective oxide layer on its surface which prevents further reactions with air or water.
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