Symbol Os Atomic radius: pm 134 Fusion: kJ/Mole 57.85
Name Osmium Ionic radius: pm (+4)63 Boiling point: C 5012
Atomic number 76 Electron affinity 1.10 Melting point: C 3033
Atomic weight 190.2 1st  ion potential 8.7 Specific Heat Cap: J/(g K) 0.13
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) 0.88
Configuration [Xe]4f145d66s2 Crystal structure Hex Electrical Cond 0.109
Oxidation states 2,3,4,6,8 Density 22.6 Abundance: mg/kg-crust 0.002
Electronegativity 2.2 Vaporization: kJ/Mole 627.6    
The English chemist, Smithson Tennant, discovered osmium along with iridium in the residues of platinum ores. Uses - hard alloys, phonograph needles, electrical light filaments, fountain pen tips