Osmium

Osmium
76Os
Ru ↑ Os ↓ Hs Tábìlì ìdásìkò rhenium ← osmium → iridium
Ìhànsójú
silvery, blue cast
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà	osmium, Os, 76
Ìpèlóhùn	/ˈɒzmiəm/, OZ-mee-əm
Ẹ̀ka ẹ́límẹ̀nti	transition metal
Ẹgbẹ́, àsìkò, àdìpò	8, 6, d
Ìwúwo átọ́mù	190.23
Ìtòléra ẹ̀lẹ́ktrónì	[Xe] 4f14 5d6 6s2 2, 8, 18, 32, 14, 2
Physical properties
Phase	solid
Density (near r.t.)	22.59 g·cm−3
Liquid density at m.p.	20 g·cm−3
Melting point	3306 K, 3033 °C, 5491 °F
Boiling point	5285 K, 5012 °C, 9054 °F
Heat of fusion	57.85 kJ·mol−1
Heat of vaporization	738 kJ·mol−1
Molar heat capacity	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	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−1
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù 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