Atomic symbol - Tm
Atomic weight - 168.93421
Atomic number - 69
Electron configuration - 2-8-18-31-8-2
Oxidation states - +3
State of matter - solid
Heavy metal-brittle
Discovered in 1879 by Per Teodor Cleve
Boils at 1727 .C, melts at 1545 .C

Notes:
Useful in small portable X-Ray units, thulium has few other uses.