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Osmium, Os

Osmium is a chemical element that has the symbol Os and atomic number 76. Osmium is a hard, brittle, blue-gray or blue-black transition metal in the platinum family, and is one of the densest natural elements, competing for this status with iridium. Osmium is used in alloys with platinum, iridium and other platinum group metals. Osmium is found in nature as an alloy in platinum ore. Alloys of osmium are employed in fountain pen tips, electrical contacts and in other applications where extreme durability and hardness are needed.

Technical Data
Symbol	Os	Melting point / °C	3045(+/-30)
Atomic number	76	Boiling point / °C	5025(+/-100)
No. of naturally occurring isotopes	7	ΔH_fus/kJmol^-1	31.7
Atomic weight	190.2	ΔH_vap/kJmol^-1	738
Electronic configuration	[Xe]4f^J45d⁶6s²	ΔH_{f(monoatomic gas)}/kJmol^-1	791 (+/-13)
Metal radius(12-coordinate)/pm	135	Electrical resistivity
Ionic radius(4-coordinate)/pm VIII	39	(20°C)/μohm cm	8.12
Ionic radius(6-coordinate)/pm VII	52.5	Electronegativity χ	2.2
Ionic radius(6-coordinate)/pm VI	54.5	Ionization energy/kJmol^-1I	840
Ionic radius(6-coordinate)/pm V	57.5	Ionization energy/kJmol^-1II	1600
Ionic radius(6-coordinate)/pm IV	63	Ionization energy/kJmol^-1III	2400
Density (20°C)/gcm^-3	22.57

Evaporation Techniques
Temperature (^oC) @Vap. Pressure			Techniques				Remarks
10^-8 Torr	10^-6 Torr	10^-4 Torr	Electron Beam	Crucible	Coil	Boat	Remarks
2170	2430	276	Fair	-	-	-

Powder
O1-10000-P -60 mesh
O1-10001-P -325 mesh

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