Question

why are metals hard and some are soft?

Answer 1

Metals are hard and soft due to their physical and chemical structure and due to the difference in rocks from which they are extracted.

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Answer 2

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Metals alloys like steel are much harder than elemental metals because they are a mixture of different elements like iron, nickel, chrome, etc. Basically, when a metal is composed uniformly of the same atom, they fit together very tightly and slide over each other easily. This is why pure gold is so soft and malleable.

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