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Osmium

Metalsolid
Symbol: Os
Atomic number: 76
Atomic mass: 190.23
Group: Transition Metal
CAS-number: 7440-04-2

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 14, 2
Orbitals: [Xe] 4f14 5d6 6s2
Electronegativity: 2.2, 1.5
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 (+4)
Covalent radius: 1.26 Å
Atomic volume: 8.49 cm³/mol
Density (293 K): 22.40 g/cm³
Crystal structure: hexagonal
hexagonal

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
184Os 0.018 183.953 0 -- --
185Os 0 185 1/2 93.6d EC View
186Os 1.59 185.954 0 2.0E15y α View
187Os 1.64 186.956 1/2 -- --
188Os 13.3 187.956 0 -- --
189Os 16.1 188.958 3/2 -- --
190Os 26.4 189.958 0 -- --
190Osm 0 190 10 9.90m IT View
191Os 0 191 9/2 15.4d β- View
191Osm 0 191 3/2 13.1h IT View
192Os 41 191.962 0 -- --
193Os 0 193 3/2 30.5h β-, β- View
194Os 0 194 0 6.0y β- View

Other info

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 temperature alloys and pressure bearings. Very hard and resists corrosion better than any other.