Osmium

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Osmium
76Os
Ru

Os

Hs
rheniumosmiumiridium
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 86, 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
Osmium has a hexagonal crystal structure
Magnetic ordering paramagnetic[1]
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)
ββ 0.414 192Pt
193Os syn 30.11 d β 1.141 193Ir
194Os syn 6 y β 0.097 194Ir
· r


Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.