Symbol Co Atomic radius: pm 125 Fusion: kJ/Mole 16.2
Name Cobalt Ionic radius: pm (+2)65 Boiling point: C 2927
Atomic number 27 Electron affinity 0.66 Melting point: C 1495
Atomic weight 58.93 1st  ion potential 7.88 Specific Heat Cap: J/(g K) 0.42
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) 1.00
Configuration [Ar]3d74s2 Crystal structure Hex Electrical Cond 0.172
Oxidation states 2,3 Density 8.86 Abundance: mg/kg-crust 25
Electronegativity 1.88 Vaporization: kJ/Mole 382.4    
Cobalt was isolated in 1735 by a Swedish chemist, Georg Brandt, but compounds had been used for centuries to impart a blue color to glazes and ceramics. Uses - alloys used in jet engines, magnets, cobalt glass (blue), ceramics, radiotherapeutic agent