Symbol Yb Atomic radius: pm 194 Fusion: kJ/Mole 0.16
Name Ytterbium Ionic radius: pm (+3)99 Boiling point: C 1196
Atomic number 70 Electron affinity - Melting point: C 819
Atomic weight 173.0 1st  ion potential 6.25 Specific Heat Cap: J/(g K) 0.16
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) 0.39
Configuration [Xe]4f146s2 Crystal structure FCC Electrical Cond 0.0351
Oxidation states 2,3 Density 6.90 Abundance: mg/kg-crust 3.2
Electronegativity - Vaporization: kJ/Mole 159.0    
The first concentrate of ytterbium was obtained in 1878 by J.C.G. de Marignac.  Georges Urbain and Carl Auer von Welsbach showed in 1907-1908 that what Marignac had found was in fact two elements, now known as ytterbium and lutetium.  Uses - alloys, metallurgic and chemical experiments, lasers