మూస:Infobox iridium

ఇరీడియం, ₀₀Ir
ఇరీడియం
Pronunciation	/ɪˈrɪdiəm/ (i-RID-ee-əm)
Appearance	వెండిలా తెల్లని
Standard atomic weight Ar°(Ir)
	192.217±0.002; 192.22±0.01 (abridged);
ఇరీడియం in the periodic table
	ఆస్మియం ← ఇరీడియం → ప్లాటినం
Group	మూస:Infobox element/symbol-to-group/format
Period	period 6
Block	d-block
Electron configuration	[Xe] 4f14 5d7 6s2
Electrons per shell	2, 8, 18, 32, 15, 2
Physical properties
Phase at STP	solid
Melting point	2739 K (2466 °C, 4471 °F)
Boiling point	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 vaporization	563 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
Atomic properties
Oxidation states	−3, –2, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8, +9
Electronegativity	Pauling scale: 2.20
Atomic radius	empirical: 136 pm
Covalent radius	141±6 pm
	Spectral lines of ఇరీడియం
Other properties
Natural occurrence	primordial
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
History
Discovery	Smithson Tennant (1803)
First isolation	Smithson Tennant (1803)
Isotopes of ఇరీడియం v; e;
	Template:infobox ఇరీడియం isotopes does not exist
	Category: ఇరీడియం; view; talk; edit; \| references

References

↑ "Standard Atomic Weights: Iridium". CIAAW. 2017.
↑ Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (in ఇంగ్లీష్). doi:10.1515/pac-2019-0603. ISSN 1365-3075.
↑ Wang, Guanjun; Zhou, Mingfei; Goettel, James T.; Schrobilgen, Gary G.; Su, Jing; Li, Jun; Schlöder, Tobias; Riedel, Sebastian (2014). "Identification of an iridium-containing compound with a formal oxidation state of IX". Nature. 514 (7523): 475–477. Bibcode:2014Natur.514..475W. doi:10.1038/nature13795. PMID 25341786. S2CID 4463905.
↑ Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.

[1] "Standard Atomic Weights: Iridium". CIAAW. 2017.

[CIAAW2021-2] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry (in ఇంగ్లీష్). doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[IrIX-3] Wang, Guanjun; Zhou, Mingfei; Goettel, James T.; Schrobilgen, Gary G.; Su, Jing; Li, Jun; Schlöder, Tobias; Riedel, Sebastian (2014). "Identification of an iridium-containing compound with a formal oxidation state of IX". Nature. 514 (7523): 475–477. Bibcode:2014Natur.514..475W. doi:10.1038/nature13795. PMID 25341786. S2CID 4463905.

[4] Magnetic susceptibility of the elements and inorganic compounds, in Lide, D. R., ed. (2005). CRC Handbook of Chemistry and Physics (86th ed.). Boca Raton (FL): CRC Press. ISBN 0-8493-0486-5.

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