Symbol	Tm	Atomic radius: pm	173	Fusion: kJ/Mole	16.84
Name	Thulium	Ionic radius: pm	(+3)109	Boiling point: °C	1950
Atomic number	69	Electron affinity	-	Melting point: °C	1545
Atomic weight	168.9	1st  ion potential	6.18	Specific Heat Cap: J/(g K)	0.16
Classification	Trans metal	Natural form	Solid	Thermal Cond: W/(cm K)	0.17
Configuration	[Xe]4f136s2	Crystal structure	Hex	Electrical Cond	0.0150
Oxidation states	2,3	Density	9.32	Abundance: mg/kg-crust	0.52
Electronegativity	1.25	Vaporization: kJ/Mole	247.0
Thulium was discovered in 1879 along with holmium by Per Teodor Cleve.			Uses - alloys, power for portable x-ray machnies