Osmyo

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Osmium
76Os
Ru

Os

Hs
rheniumosmiumiridium
Appearance
silvery, blue cast
General properties
Name, simbolo, kaiphan osmium, Os, 76
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category puthaw nga transisyon
Group, period, block 86, d
Standard atomic weight 190.23
Electron configuration [Xe] 4f14 5d6 6s2
2, 8, 18, 32, 14, 2
Electron shells of osmium (2, 8, 18, 32, 14, 2)
History
Discovery Smithson Tennant (1803)
First isolation Smithson Tennant (1803)
Physical properties
Phase magahi
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
Most stable isotopes
Main article: Isotopes of osmium
iso NA half-life DM DE (MeV) DP
184Os 0.02% >5.6×1013 y β+β+ 1.452 184W
α 2.963 180W
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 ββ 0.4135 192Pt
α 0.3622 188W
193Os syn 30.11 d β 1.141 193Ir
194Os syn 6 y β 0.097 194Ir
t  h  u
· r

Ang osmyo (Iningles osmium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Os ug kaiphan nga atomik 76. Ang osmyo mao ang puthaw nga transisyon.

Ang mga gi basihan niini[usba | edit source]

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


Galeriya sa hulagway[usba | edit source]