Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,15,2 Orbitals: [Xe] 4f14 5d7 6s2 Electronegativity: 1.5, 2.2 1. Ionization potential: 9.1 eV 2. Ionization potential: -- eV 3. Ionization potential: -- eV Oxidation states: 6,4,3,2,1,0,-1 Electrical conductivity: 0.197 10^6		Melting point: 2410 °C Boiling point: 4130 °C Specific heat: 0.130 J/gK Heat of fusion: 26.10 kJ/mol Heat of vaporization: 604.0 kJ/mol Thermal conductivity: 1.47 W/cmK		Atomic radius: 1.87 Å Ionic radius: 0.63 Å () Covalent radius: 1.27 Å Atomic volume: 8.54 cm³/mol Density (293 K): 22.42 g/cm³ Crystal structure: Cubic: Face centered

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
188Ir	0	188	2	1.72d	EC,+	View
189Ir	0	189	3/2	13.2d	EC	View
190Ir	0	190	4	11.8d	EC	View
190Irm	0	190	7	1.20h	IT	View
190m2Ir	0	190	11	3.20h	EC,+,IT	View
191Ir	37.3	190.961	3/2	--	stable	--
191Irm	0	191	11/2	4.93s	IT	View
192Ir	0	192	4	73.83d	-,EC	View
193Ir	62.7	192.963	3/2	--	stable	--
193Irm	0	193	11/2	10.53d	IT	View
194Ir	0	194	1	19.3h	-	View
194Irm	0	194	11	170d	-	View

Legend

Name origin:	Latin: iris (rainbow).
Description:	Heavy, brittle, white metal.
Discovered by:	S.Tenant, A.F.Fourcory, L.N.Vauquelin, H.V.Collet-Descoltils
Year:	1804
Place:	England/France
Sources:	Found in gravel deposits with platinum.
Use(s):	Used with osmium to tip gold pen points, to make crucible and special containers. Also to make alloys used for standard weights and measures, and heat-resistant alloys. Also as hardening agent for platinum.