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Thulium is a chemical element originated from Thule, the ancient name for Scandinavia. It was first mentioned in 1879 and observed by T. Cleve. The isolation was later accomplished and announced by T. Cleve. “Tm” is the canonical chemical symbol of thulium. Its atomic number in the periodic table of elements is 69 with location at Period 6 and Group 3, belonging to the f-block. The relative atomic mass of thulium is 168.93421(2) Dalton, the number in the brackets indicating the uncertainty.