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Atomic symbol Tm
Atomic number 69
Classification Metallic
Atomic mass 168.93421 amu
Other Information
Date of discovery 1879
Name of discoverer Per Teodor Cleve
Name origin From Thule, the ancient name of Scandinavia.
Uses Radioactive thulium is used to power portable x-ray machines, eliminating the need for electrical equipment.
Obtained from Found chiefly in monazite and bastnasite ores

Thulium is the rarest of the rare earth metals.