Name :  Thulium
Symbol :  Tm
Atomic Number :  69
Atomic Weight :  168.93421
Specific Heat :  0.16 J/gK
Melting Point :  1545°C
Vaporization :  191.0 kJ/mol
Boiling Point :  1950°C
Electronegativity :  1.25
Density@293 K :  9.33 g/cm³
Discovered :  Per Theodor Cleve, Sweden, 1879
Description :  Soft, malleable, ductile, silvery metal
Uses :  Radioactive thulium is used to power portable x-ray machines, eliminating the need for electrical equipment.