Name       : Erbium
Symbol     : Er
Atomic #   : 68
Atom weight: 167.26
Melting P. : 1529
Boiling P. : 2868
Oxidation  : +3
Pronounced : UR-bi-em
From       : 
Identified : C.G. Mosander in 1843
Appearance : Soft, malleable, silvery metal
Note       : Might have called akatatasium (Greek akatastasia, "confusion")
             
[Properties]

  Pure erbium is soft and malleable. It has a silvery metallic luster that
tarnishes only slightly in air. It is a member of the lanthanide group of
elements that fit onto the periodic chart between lantanum (element 57)
and hafnium (element 72).
  Erbium has unusual magnetic properties, including the fact that it is
antiferromagnetic across a fairly wide range of low temperatures. It
becomes superconductive at very low temperatures.