Thulium
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Thulium is a chemical element, having the chemical symbol Tm.
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Its atomic number (the number of protons) is 69. It has a Standard Atomic Weight of 168.93421(2), and is typically found as a solid in its elemental form.
Thulium is considered to be a member of the "Lanthanide" class of elements, has a boiling point of 1,950 °C , and a melting point of 1,545 °C .