ଛାଞ୍ଚ:Infobox Iridium

Iridium,  ₇₇Ir

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	iridium, Ir
Appearance	silvery white
ଉଚ୍ଚାରଣ	/ˈrɪdiəm/ i-RID-ee-əm
Iridium in the periodic table
Rh ↑ Ir ↓ Mt osmium ← iridium → platinum
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	77
ଶ୍ରେଣୀ, ବ୍ଳକ	group 9, d-block
ପର୍ଯ୍ୟାୟ	period 6
ମୌଳିକ ପ୍ରକାର	transition metal
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	192.217
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Xe] 4f14 5d7 6s2
per shell	2, 8, 18, 32, 15, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	2739 K ​(2466 °C, ​4471 °F)
ସ୍ଫୁଟନାଙ୍କ	4701 K ​(4428 °C, ​8002 °F)
Density near r.t.	22.56 g/cm3
when liquid, at m.p.	19 g/cm3
Heat of fusion	41.12 kJ/mol
Heat of	563 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2713 2957 3252 3614 4069 4659
Atomic properties
Oxidation states	−3,−1, 0, 1, 2, 3, 4, 5, 6
Electronegativity	Pauling scale: 2.20
Atomic radius	empirical: 136 pm
Covalent radius	141±6 pm
Miscellanea
Crystal structure	​face-centered cubic (fcc)
Speed of sound thin rod	4825 m/s (at 20 °C)
Thermal expansion	6.4 µm/(m·K)
Thermal conductivity	147 W/(m·K)
Electrical resistivity	47.1 n Ω·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	528 GPa
Shear modulus	210 GPa
Bulk modulus	320 GPa
Poisson ratio	0.26
Mohs hardness	6.5
Vickers hardness	1760 MPa
Brinell hardness	1670 MPa
CAS Number	7439-88-5
ଇତିହାସ
ଆବିଷ୍କାର	Smithson Tennant (1803)
First isolation	Smithson Tennant (1803)
Most stable isotopes of iridium
iso NA half-life DM DE (MeV) DP 188Ir syn 1.73 d ε 1.64 188Os 189Ir syn 13.2 d ε 0.532 189Os 190Ir syn 11.8 d ε 2.000 190Os 191Ir 37.3% 191Ir is stable with 114 neutrons 192Ir syn 73.827 d β– 1.460 192Pt ε 1.046 192Os 192m2Ir syn 241 y IT 0.161 192Ir 193Ir 62.7% 193Ir is stable with 116 neutrons 193mIr syn 10.5 d IT 0.080 193Ir 194Ir syn 19.3 h β– 2.247 194Pt 194m2Ir syn 171 d IT - 194Ir

References

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