Template:Infobox osmium

	child table, as reused in {IB-Os} v; e; h;
Main isotopes of osmium

Osmium, ₇₆Os
Osmium
Pronunciation	/ˈɒzmiəm/ (OZ-mee-əm)
Appearance	silvery, blue cast
Standard atomic weight Ar°(Os)
	190.23±0.03; 190.23±0.03 (abridged);
Osmium in the periodic table
	rhenium ← osmium → iridium
Atomic number (Z)	76
Group	group 8
Period	period 6
Block	d-block
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	5281 K (5008 °C, 9046 °F)
Density (at 20° C)	22.587 g/cm3
when liquid (at m.p.)	20 g/cm3
Heat of fusion	31 kJ/mol
Heat of vaporization	378 kJ/mol
Molar heat capacity	24.7 J/(mol·K)
Atomic properties
Oxidation states	−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8 (a mildly acidic oxide)
Electronegativity	Pauling scale: 2.2
Ionization energies	1st: 840 kJ/mol ; 2nd: 1600 kJ/mol ; ;
Atomic radius	empirical: 135 pm
Covalent radius	144±4 pm
	Spectral lines of osmium
Other properties
Natural occurrence	primordial
Crystal structure	hexagonal close-packed (hcp) (hP2)
Lattice constants	a = 273.42 pm; c = 431.99 pm (at 20 °C)
Thermal expansion	4.99×10−6/K (at 20 °C)
Thermal conductivity	87.6 W/(m⋅K)
Electrical resistivity	81.2 nΩ⋅m (at 0 °C)
Magnetic ordering	paramagnetic
Molar magnetic susceptibility	11×10−6 cm3/mol
Shear modulus	222 GPa
Bulk modulus	462 GPa
Speed of sound thin rod	4940 m/s (at 20 °C)
Poisson ratio	0.25
Mohs hardness	7.0
Vickers hardness	4137 MPa
Brinell hardness	3920 MPa
CAS Number	7440-04-2
History
Discovery and first isolation	Smithson Tennant (1803)
Isotopes of osmium v; e;
	Category: Osmium; view; talk; edit; \| references

Os · Osmium
Re ← ibox Re	^iso ₇₆Os [e] IB-Os [e] IBisos [e]	→ Ir ibox Ir
cat:Os (5) cat:Os-isotopes (45) Commons Wikidata:Q751 Wiktionary
indexes by PT (page) v e

Data sets read by {{Infobox element}}
Name and identifiers	view edit
Symbol etymology (11 non-trivial)	view edit
Top image (caption, alt)	view edit
Pronunciation	view edit
Allotropes (overview)	view edit
Group (overview)	view edit
Period (overview)	view edit
Block (overview)	view edit
Natural occurrence	view edit
Phase at STP	view edit
Oxidation states	view edit
Spectral lines image	view edit
Electron configuration (cmt, ref)	view edit
Isotopes
Standard atomic weight	view edit
most stable isotope	view edit
Wikidata
Wikidata *	view edit
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (11) · (this table: v )

Notes

^ The thermal expansion of Os is anisotropic: the coefficients for each crystal axis (at 20 °C) are: α_a = 4.57×10⁻⁶/K, α_c = 5.85×10⁻⁶/K, and α_average = α_V/3 = 4.99×10⁻⁶/K.

References

^ "Standard Atomic Weights: Osmium". CIAAW. 1991.
^ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
^ Rumble, John R.; Bruno, Thomas J.; Doa, Maria J. (2022). "Section 4: Properties of the Elements and Inorganic Compounds". CRC Handbook of Chemistry and Physics: A Ready Reference Book of Chemical and Physical Data (103rd ed.). Boca Raton, FL: CRC Press. p. 40. ISBN 978-1-032-12171-0.
^ Rumble, John R.; Bruno, Thomas J.; Doa, Maria J. (2022). "Section 4: Properties of the Elements and Inorganic Compounds". CRC Handbook of Chemistry and Physics: A Ready Reference Book of Chemical and Physical Data (103rd ed.). Boca Raton, FL: CRC Press. p. 40. ISBN 978-1-032-12171-0.
^ Rumble, John R.; Bruno, Thomas J.; Doa, Maria J. (2022). "Section 4: Properties of the Elements and Inorganic Compounds". CRC Handbook of Chemistry and Physics: A Ready Reference Book of Chemical and Physical Data (103rd ed.). Boca Raton, FL: CRC Press. p. 40. ISBN 978-1-032-12171-0.
^ Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.
^ ^7.0 ^7.1 Haynes 2011, p. 4.134.
^ ^8.0 ^8.1 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
^ ^9.0 ^9.1 Peters, Stefan T.M.; Münker, Carsten; Becker, Harry; Schulz, Toni (April 2014). "Alpha-decay of ¹⁸⁴Os revealed by radiogenic ¹⁸⁰W in meteorites: Half life determination and viability as geochronometer". Earth and Planetary Science Letters. 391: 69–76. doi:10.1016/j.epsl.2014.01.030.

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[7] The thermal expansion of Os is anisotropic: the coefficients for each crystal axis (at 20 °C) are: α_a = 4.57×10⁻⁶/K, α_c = 5.85×10⁻⁶/K, and α_average = α_V/3 = 4.99×10⁻⁶/K.

[1] "Standard Atomic Weights: Osmium". CIAAW. 1991.

[CIAAW2021-2] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[3] Rumble, John R.; Bruno, Thomas J.; Doa, Maria J. (2022). "Section 4: Properties of the Elements and Inorganic Compounds". CRC Handbook of Chemistry and Physics: A Ready Reference Book of Chemical and Physical Data (103rd ed.). Boca Raton, FL: CRC Press. p. 40. ISBN 978-1-032-12171-0.

[4] Rumble, John R.; Bruno, Thomas J.; Doa, Maria J. (2022). "Section 4: Properties of the Elements and Inorganic Compounds". CRC Handbook of Chemistry and Physics: A Ready Reference Book of Chemical and Physical Data (103rd ed.). Boca Raton, FL: CRC Press. p. 40. ISBN 978-1-032-12171-0.

[5] Rumble, John R.; Bruno, Thomas J.; Doa, Maria J. (2022). "Section 4: Properties of the Elements and Inorganic Compounds". CRC Handbook of Chemistry and Physics: A Ready Reference Book of Chemical and Physical Data (103rd ed.). Boca Raton, FL: CRC Press. p. 40. ISBN 978-1-032-12171-0.

[Arblaster_2018-6] Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.

[FOOTNOTEHaynes20114.134-8] 7.0 ^7.1 Haynes 2011, p. 4.134.

[NUBASE2020-9] 8.0 ^8.1 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[184Os-10] 9.0 ^9.1 Peters, Stefan T.M.; Münker, Carsten; Becker, Harry; Schulz, Toni (April 2014). "Alpha-decay of ¹⁸⁴Os revealed by radiogenic ¹⁸⁰W in meteorites: Half life determination and viability as geochronometer". Earth and Planetary Science Letters. 391: 69–76. doi:10.1016/j.epsl.2014.01.030.

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