Lutetium
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Lutetium is a chemical element, having the chemical symbol Lu.
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Its atomic number (the number of protons) is 71. It has a Standard Atomic Weight of 174.967(1), and is typically found as a solid in its elemental form.
Lutetium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 3,402 °C , and a melting point of 1,663 °C .