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Name Thulium
Symbol Tm
Atomic number 69
Atomic mass 168.93421 amu
Normal state Solid
Classification Metallic
Crystal structure Hexagonal
Color Silver colored, tarnishes in air and reacts with water.
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.