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Lutetium, a chemical element with the symbol Lu, is classified as a rare earth metal and is relatively hard compared to many other metals. It has a hardness similar to that of titanium, making it more challenging to work with than softer metals like aluminum or copper. However, it is not the hardest of metals; for instance, tungsten and chromium are significantly harder. Overall, lutetium's hardness contributes to its utility in various high-temperature and high-strength applications.

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1mo ago

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