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Question:

Why is steel harder than aluminum?

I am able to bend a (thin) bar of aluminum with my hands but not a steel bar.

Answer:

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IMO, iron atoms tend to form crystals as they coolSoft metals don'tYou can probably get a more detailed answer by looking at the periodic table and comparing hard and soft metals with their electron structureAnd since you mention steel, that's an alloy of iron and carbon with more complex internal structure (but I could be wrong)

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