Symbol	Er	Atomic radius: pm	173	Fusion: kJ/Mole	19.9
Name	Erbium	Ionic radius: pm	(+3)100	Boiling point: °C	2868
Atomic number	68	Electron affinity	-	Melting point: °C	1529
Atomic weight	167.3	1st  ion potential	6.11	Specific Heat Cap: J/(g K)	0.17
Classification	Trans metal	Natural form	Solid	Thermal Cond: W/(cm K)	0.15
Configuration	[Xe]4f126s2	Crystal structure	Hex	Electrical Cond	0.0117
Oxidation states	3	Density	9.07	Abundance: mg/kg-crust	3.5
Electronegativity	1.24	Vaporization: kJ/Mole	293.0
Erbium was discovered in 1843 as an oxide by C.G. Mosander.			Uses - alloys, photographic filter, colorant in glasses and porcelain enamel glazes