Symbol Dy Atomic radius: pm 175 Fusion: kJ/Mole 11.06
Name Dysprosium Ionic radius: pm (+3)103 Boiling point: C 2567
Atomic number 66 Electron affinity - Melting point: C 1412
Atomic weight 162.5 1st  ion potential 5.94 Specific Heat Cap: J/(g K) 0.17
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) 0.11
Configuration [Xe]4f106s2 Crystal structure Hex Electrical Cond 0.0108
Oxidation states 3 Density 8.55 Abundance: mg/kg-crust 5.2
Electronegativity 1.22 Vaporization: kJ/Mole 293.0    
Dysprosium was first found in 1886 by P.-. Lecoq de Boisbaudran with holmium and other heavy rare earths.  Georges Urbain was able to prepare a resonably pure sample in 1906. Uses - alloys, CD disks