Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,14,2 Orbitals: [Xe] 4f14 5d6 6s2 Electronegativity: 1.5, 2.2 1. Ionization potential: 8.7 eV 2. Ionization potential: -- eV 3. Ionization potential: -- eV Oxidation states: 8,6,4,3,2,0,-2 Electrical conductivity: 0.109 10^6		Melting point: 3054 °C Boiling point: 5027 °C Specific heat: 0.13 J/gK Heat of fusion: 31.80 kJ/mol Heat of vaporization: 746.0 kJ/mol Thermal conductivity: 0.876 W/cmK		Atomic radius: 1.92 Å Ionic radius: 0.63 Å () Covalent radius: 1.26 Å Atomic volume: 8.49 cm³/mol Density (293 K): 22.40 g/cm³ Crystal structure: Hexagonal

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
184Os	0.018	183.953	0	--	stable	--
185Os	0	185	1/2	93.6d	EC	View
186Os	1.59	185.954	0	2.0E15y		View
187Os	1.64	186.956	1/2	--	stable	--
188Os	13.3	187.956	0	--	stable	--
189Os	16.1	188.958	3/2	--	stable	--
190Os	26.4	189.958	0	--	stable	--
190Osm	0	190	10	9.90m	IT	View
191Os	0	191	9/2	15.4d	-	View
191Osm	0	191	3/2	13.1h	IT	View
192Os	41	191.962	0	--	stable	--
193Os	0	193	3/2	30.5h	-,b-	View
194Os	0	194	0	6.0y	-	View

Legend

Name origin:	Greek: osmê (odor).
Description:	Hard fine black powder or hard, lustrous, blue-white metal.
Discovered by:	Smithson Tenant
Year:	1804
Place:	England
Sources:	Obtained from the same ores as platinum.
Use(s):	Used to tip gold pen points, instrument pivots, to make electric light filaments. Used for high temp. alloys and pressure bearings. Very hard and resists corrosion better than any other.