Template:Infobox osmium

Osmium,  ₇₆Os

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	silvery, blue cast
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Osmium in the periodic table
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Atomic number (Z)	76
Group	Template:Infobox element/group
Period	period 6
Block	d-block
Element category	Template:Infobox element/category format
Electron configuration	[Xe] 4f14 5d6 6s2
Electrons per shell	2, 8, 18, 32, 14, 2
Physical properties
Phase at STP	solid
Melting point	3306 K ​(3033 °C, ​5491 °F)
Boiling point	5285 K ​(5012 °C, ​9054 °F)
Density (near r.t.)	22.59 g/cm3
when liquid (at m.p.)	20 g/cm3
Heat of fusion	31 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	378 kJ/mol
Molar heat capacity	24.7 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 2.2
[[Ionization energy|Template:Engvar energies]]	1st: 840 kJ/mol 2nd: 1600 kJ/mol
Atomic radius	empirical: 135 pm
Covalent radius	144±4 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound thin rod	4940 m/s (at 20 °C)
Thermal expansion	5.1 µm/(m·K) (at 25 °C)
Thermal conductivity	87.6 W/(m·K)
Electrical resistivity	81.2 nΩ·m (at 0 °C)
Magnetic ordering	paramagneticTemplate:Sfn
Magnetic susceptibility	11·10−6 cm3/molTemplate:Sfn
Shear modulus	222 GPa
Bulk modulus	462 GPa
Poisson ratio	0.25
Mohs hardness	7.0
Vickers hardness	300 MPa
Brinell hardness	293 MPa
CAS Number	7440-04-2
History
Discovery and first isolation	Smithson Tennant (1803)
Main isotopes of osmium
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