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Technical data for Osmium

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Overview
NameOsmium
SymbolOs
Atomic Number76
Atomic Weight190.23
Density22.59 g/cm3
Melting Point3033 °C
Boiling Point5012 °C

Thermal properties
PhaseSolid
Melting Point3033 °C
Boiling Point5012 °C
Absolute Melting Point3306 K
Absolute Boiling Point5285 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion31 kJ/mol
Heat of Vaporization630 kJ/mol
Heat of CombustionN/A
Specific Heat130 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity88 W/(m K)
Thermal Expansion5.1×10-6 K-1

Bulk physical properties
Density22.59 g/cm3
Density (Liquid)20 g/cm3
Molar Volume8.421×10-6
Brinell Hardness3920 MPa
Mohs Hardness7 MPa
Vickers HardnessN/A
Bulk ModulusN/A
Shear Modulus222 GPa
Young ModulusN/A
Poisson Ratio0.25
Refractive IndexN/A
Speed of Sound4940 m/s
Thermal Conductivity88 W/(m K)
Thermal Expansion5.1×10-6 K-1

Reactivity
Valence6
Electronegativity2.2
ElectronAffinity106.1 kJ/mol
Ionization Energies
840, 1.6×103 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard Class4.1
DOT Numbers3089
EU NumberN/A
NFPA Fire Rating4
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity Rating1
RTECS NumberRTECSRN1100000
NFPA LabelNFPA Label

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group8
Period6
Electron Configuration[Xe]4f145d66s2
ColorSlateGray
Discovery
1803 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-04-2
CID NumberCID23937
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSRN1100000

Electrical properties
Electrical TypeConductor
Electrical Conductivity1.2×107 S/m
Resistivity8.1×10-8 m Ω
Superconducting Point0.66

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility6×10-10
Molar Magnetic Susceptibility1.1×10-10
Volume Magnetic Susceptibility0.000014

Abundances
% in Universe3×10-7%
% in Sun2×10-7%
% in Meteorites0.000066%
% in Earth's Crust1.8×10-7%
% in OceansN/A
% in HumansN/A

Atomic dimensions and structure
Atomic Radius185 pm
Covalent Radius128 pm
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
273.44, 273.44, 431.73 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers5D4
Neutron Cross Section15
Neutron Mass Absorption0.0023
Known Isotopes
162Os, 163Os, 164Os, 165Os, 166Os, 167Os, 168Os, 169Os, 170Os, 171Os, 172Os, 173Os, 174Os, 175Os, 176Os, 177Os, 178Os, 179Os, 180Os, 181Os, 182Os, 183Os, 184Os, 185Os, 186Os, 187Os, 188Os, 189Os, 190Os, 191Os, 192Os, 193Os, 194Os, 195Os, 196Os
Stable Isotopes
184Os, 187Os, 188Os, 189Os, 190Os, 192Os
Isotopic Abundances
184Os0.02%
186Os1.59%
187Os1.96%
188Os13.24%
189Os16.15%
190Os26.26%
192Os40.78%


Notes on the properties of Osmium:

Specific Heat: Value given for solid phase.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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