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Pure elemental aluminum isn't stable. The aluminum used in cans and such is an alloy and not pure elemental aluminum. My chemistry teacher blew a hole in the ceiling tiles of the classroom when he showed this off. The sodium didn't react nearly as violently (but he also used a much smaller chunk).
Are you referring to the immediate oxidation of the outer layer when exposed to air?
aluminum is stable in the sense that the outer layer oxidizes rapidly and prevents the rest of the metal from reacting with anything. the reason thermite is so exothermic is because of massive amount of surface area provide by the powdered metal. a chunk of aluminum simply isn't dangerous.