Osmium

Osmium, ₇₆Os

Osmium
Pípè	/ˈɒzmiəm/ ​(OZ-mee-əm)
Ìhànsójú	silvery, blue cast
Ìwúwo átọ̀mù Ar, std(Os)	190.23(3)[1]
Osmium ní orí tábìlì àyè
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
Nọ́mbà átọ̀mù (Z)	76
Ẹgbẹ́	group 8
Àyè	àyè 6
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Xe] 4f14 5d6 6s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 18, 32, 14, 2
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	3306 K ​(3033 °C, ​5491 °F)
Ígbà ìhó	5285 K ​(5012 °C, ​9054 °F)
Kíki (near r.t.)	22.59 g/cm3
when liquid (at m.p.)	20 g/cm3
Heat of fusion	57.85 kJ/mol
Heat of	738 kJ/mol
Molar heat capacity	24.7 J/(mol·K)
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 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 2.2
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
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 n Ω·m (at 0 °C)
Magnetic ordering	paramagnetic[2]
Shear modulus	222 GPa
Bulk modulus	462 GPa
Poisson ratio	0.25
Mohs hardness	7.0
Brinell hardness	3920 MPa
CAS Number	7440-04-2
Main isotopes of osmium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 184Os 0.02% >5.6×1013 y (not observed) εε 1.452 184W 185Os syn 93.6 d ε 1.013 185Re 186Os 1.59% 2.0×1015 y α 2.822 182W 187Os 1.96% 187Os is stable with 111 neutrons 188Os 13.24% 188Os is stable with 112 neutrons 189Os 16.15% 189Os is stable with 113 neutrons 190Os 26.26% 190Os is stable with 114 neutrons 191Os syn 15.4 d β− 0.314 191Ir 192Os 40.78% >9.8×1012 y (not observed) β−β− 0.414 192Pt 193Os syn 30.11 d β− 1.141 193Ir 194Os syn 6 y β− 0.097 194Ir
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