ଛାଞ୍ଚ:Infobox Osmium

Osmium,  ₇₆Os

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	osmium, Os
Appearance	silvery, blue cast
ଉଚ୍ଚାରଣ	/ˈɒzmiəm/ OZ-mee-əm
Osmium in the periodic table
Ru ↑ Os ↓ Hs rhenium ← osmium → iridium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	76
ଶ୍ରେଣୀ, ବ୍ଳକ	group 8, d-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	transition metal
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	190.23
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 4f14 5d6 6s2
per shell	2, 8, 18, 32, 14, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	3306 K ​(3033 °C, ​5491 °F)
ସ୍ଫୁଟନାଙ୍କ	5285 K ​(5012 °C, ​9054 °F)
Density near r.t.	22.59 g/cm3
when liquid, at m.p.	20 g/cm3
Heat of fusion	57.85 kJ/mol
Heat of	738 kJ/mol
Molar heat capacity	24.7 J/(mol·K)
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	Pauling scale: 2.2
Atomic radius	empirical: 135 pm
Covalent radius	144±4 pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	4940 m/s (at 20 °C)
Thermal expansion	5.1 µm/(m·K) (at 25 °C)
Thermal conductivity	87.6 W/(m·K)
Electrical resistivity	81.2 n Ω·m (at 0 °C)
Magnetic ordering	paramagnetic
Shear modulus	222 GPa
Bulk modulus	462 GPa
Poisson ratio	0.25
Mohs hardness	7.0
Brinell hardness	3920 MPa
CAS Number	7440-04-2
ଇତିହାସ
ଆବିଷ୍କାର	Smithson Tennant (1803)
First isolation	Smithson Tennant (1803)
Most stable 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

References

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