Osmyo

Osmium
76Os
Ru ↑ Os ↓ Hs Periodic table rhenium ← osmium → iridium
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	8, 6, d
Standard atomic weight	190.23
Electron configuration	[Xe] 4f14 5d6 6s2 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
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
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 β−β− 0.4135 192Pt α 0.3622 188W 193Os syn 30.11 d β− 1.141 193Ir 194Os syn 6 y β− 0.097 194Ir

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.

Galeriya sa hulagway

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