Symbol Tb Atomic radius: pm 176 Fusion: kJ/Mole 10.15
Name Terbium Ionic radius: pm (+3)118 Boiling point: C 3230
Atomic number 65 Electron affinity - Melting point: C 1356
Atomic weight 158.9 1st  ion potential 5.86 Specific Heat Cap: J/(g K) 0.18
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) 0.11
Configuration [Xe]4f96s2 Crystal structure Hex Electrical Cond 0.00889
Oxidation states 3,4 Density 8.23 Abundance: mg/kg-crust 1.2
Electronegativity - Vaporization: kJ/Mole 391.0    
Terbium was discovered in 1843 by Carl Gustaf Mosander, but its existence was not confirmed for about 30 years.  Pure compounds were not prepared until 1905. Uses - aloys, color TV's