Symbol	Ir	Atomic radius: pm	136	Fusion: kJ/Mole	41.12
Name	Iridium	Ionic radius: pm	(+4)63	Boiling point: °C	4428
Atomic number	77	Electron affinity	1.57	Melting point: °C	2446
Atomic weight	192.2	1st  ion potential	9.1	Specific Heat Cap: J/(g K)	0.13
Classification	Trans metal	Natural form	Solid	Thermal Cond: W/(cm K)	1.47
Configuration	[Xe]4f145d76s2	Crystal structure	FCC	Electrical Cond	0.197
Oxidation states	2,3,4,6	Density	22.5	Abundance: mg/kg-crust	0.001
Electronegativity	2.2	Vaporization: kJ/Mole	563.6
Iridium was discovered in 1804 in the acid-insoluble residues of platinum ores by the English chemist, Smithson Tennant.			Uses - sparkplugs, crucibles, hardening agent for platinum