Template:Infobox osmium

Osmium, ₇₆Os

File:Osmium crystals.jpg
Osmium
Pronunciation	/ˈɒzmiəm/ ​(OZ-mee-əm)
Appearance	silvery, blue cast
Standard atomic weight Ar°(Os)
	190.23(3)
Osmium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Ru ↑ Os ↓ Hs 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	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
Heat of vaporization	378 kJ/mol
Molar heat capacity	24.7 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 3160 3423 3751 4148 4638 5256
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
Color lines in a spectral range Spectral lines of osmium
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal close-packed (hcp) Hexagonal close packed crystal structure for osmium
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	paramagnetic
Molar magnetic susceptibility	11×10−6 cm3/mol
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)
Isotopes of osmium
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 184Os 0.02% 1.12×1013 y α 180W 185Os synth 93.6 d ε 185Re 186Os 1.59% 2.0×1015 y α 182W 187Os 1.96% stable 188Os 13.2% stable 189Os 16.1% stable 190Os 26.3% stable 191Os synth 15.4 d β− 191Ir 192Os 40.8% stable 193Os synth 30.11 d β− 193Ir 194Os synth 6 y β− 194Ir

PTOsmium

Re ← i'box Re	iso 76Os () infobox () isobox	→ Ir i'box Ir
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Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
most stable isotope
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Wikidata *
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References

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