Osmium

rhenium ← osmium → iridium Ru ↑ Os ↓ Hs 76Os Periodic table
Ìfarahàn
silvery, blue cast
Àwọn ìní àníkárí
Orúkọ, àmì-ìdámọ̀, nọ́mbà	osmium, Os, 76
Ìpè	/ˈɒzmiəm/, OZ-mee-əm
Ẹ̀ka apilẹ̀sẹ̀	transition metal
Àdìpọ̀, ìgbà, block	8, 6, d
Ìwúwo átọ́mù	190.23 g·mol−1
Ìtòjọ ẹ̀lẹ́ktrónì	[Xe] 4f14 5d6 6s2
Àwọn ẹ̀lẹ́ktrónì lórí ọ̀nà kan	2, 8, 18, 32, 14, 2 (Image)
Àwọn ìní aláfójúrí
Phase	solid
Kíki (tó súnmọ́ r.t.)	22.59 g·cm−3
Liquid density at m.p.	20 g·cm−3
ojúàmì ìyọ́	3306 K, 3033 °C, 5491 °F
ajúàmì ìhó	5285 K, 5012 °C, 9054 °F
Heat of fusion	57.85 kJ·mol−1
Heat of vaporization	738 kJ·mol−1
Specific heat capacity	(25 °C) 24.7 J·mol−1·K−1
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	8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2 (mildly acidic oxide)
Electronegativity	2.2 (Pauling scale)
Ionization energies	1st: 840 kJ·mol−1
	2nd: 1600 kJ·mol−1
Atomic radius	135 pm
Covalent radius	144±4 pm
Miscellanea
Crystal structure	hexagonal
Magnetic ordering	paramagnetic
Electrical resistivity	(0 °C) 81.2 nΩ·m
Thermal conductivity	(300 K) 87.6 W·m−1·K−1
Thermal expansion	(25 °C) 5.1 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 4940 m/s
Shear modulus	222 GPa
Bulk modulus	462 GPa
Poisson ratio	0.25
Mohs hardness	7.0
Brinell hardness	3920 MPa
CAS registry number	7440-04-2
Most stable isotopes
Main article: Isotopes of osmium
iso NA half-life DM DE (MeV) DP 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