Iridium (Ir)
transition-metalSolid
Peso atômico padrão
192,217 uConfiguração eletrônica
[Xe] 6s2 4f14 5d7Ponto de fusão
2445,85 °CPonto de ebulição
4427,85 °CDensidade
2,25622e+4 kg/m³Estados de oxidação
−3, −2, −1, +1, +2, +3, +4, +5, +6, +7, +8, +9Eletronegatividade (Pauling)
2,2Energia de ionização (1ª)
8,96702 eVAno da descoberta
1803Raio atômico
135 pmDetalhes
Iridium is a very dense platinum-group transition metal with exceptional resistance to corrosion and high-temperature attack. It occurs naturally mainly with platinum-group minerals and in nickel-copper sulfide ores. Chemically it forms robust complexes, especially in oxidation states +3 and +4, and it is notable for the global iridium anomaly associated with the Cretaceous-Paleogene boundary impact layer.
Iridium, a metal of the platinum family, is white (similar to platinum) but with a slight yellowish cast. Because iridium is very hard and brittle, it is hard to machine, form, or work.
It is the most corrosion-resistant metal known, and was used in making the standard meter bar of Paris, which is a 90 percent platinum and 10 percent iridium alloy. This meter bar was replaced in 1960 as a fundamental unit of length (see Krypton).
Iridium is not attacked by any of the acids nor by aqua regia, but is attacked by molten salts, such as NaCl and NaCN. The specific gravity of iridium is to osmium's specific gravity. Calculations of the densities of iridium and osmium from the space lattices give values of 22.65 and 22.61 g/cm^3, respectively. These values may be more reliable than actual physical measurements for determining which element is heavier.
The name derives from the Latin Iris, the Greek goddess of rainbows, because of the variety of colours in the element's salt solutions. Iridium and osmium were both discovered in a crude platinum ore in 1803 by the English chemist Smithson Tennant. Iridium was discovered independently by the French chemist H. V. Collet-Descotils, who actually published his paper one month before Tennant, but Tennant is given credit for the discovery, perhaps because he alone also found osmium in the ore.
Iridium and osmium were discovered at the same time by the British chemist Smithson Tennant in 1803. Iridium and osmium were identified in the black residue remaining after dissolving platinum ore with aqua regia, a mixture of 25% nitric acid (HNO3) and 75% hydrochloric acid (HCl). Today, iridium is still obtained from platinum ores and as a by-product of mining nickel.
From the Latin word iris meaning rainbow. Tennant discovered iridium in 1803 in the residue left when crude platinum is dissolved by aqua regia. The name iridium is appropriate because its salts are highly colored.
Pure iridium is a hard, brittle, silvery-white metal with a high luster. It remains bright in air under ordinary conditions and has an unusually high melting point. Bulk metal is difficult to machine because of its hardness and brittleness.
Iridium is used where chemical durability and high-temperature strength justify its cost. Major applications include crucibles for growing oxide crystals, spark-plug electrodes, electrical contacts, and wear-resistant alloys with platinum or osmium. Iridium coatings and components are used in some aerospace and industrial equipment. Radioisotope thermoelectric generators have used ¹⁹²Ir? No; ¹⁹²Ir is chiefly a gamma source for industrial radiography and some brachytherapy, not an energy source.
Pure iridium is very brittle and is nearly impossible to machine. It is primarily used as a hardening agent for platinum. Platinum-iridium alloys are used to make crucibles and other high temperature equipment. Iridium is also alloyed with osmium to make the tips of fountain pens and compass bearings.
Iridium is the most corrosive resistant metal known. For this reason, the standard meter bar was created from an alloy of 90% platinum and 10% iridium. This bar was replaced as the definition of the meter in 1960 when the meter was redefined in terms of the orange-red spectral line of krypton-86.
A thin, worldwide layer of iridium exists in a layer of sediment that was put down at the end of the Cretaceous period. Since meteors and asteroids contain a higher percentage of iridium than the earth's crust, this iridium enriched layer is seen as evidence that the earth was struck by a large meteor or asteroid at that time. Dust from the impact would have spread around the globe, depositing the iridium. The dust also would have blocked the sun for a time, resulting in the extinction of many plant and animal species, including the dinosaurs.
Although its principal use is as a hardening agent for platinum, iridium is also used to make crucibles and devices requiring high temperatures. It is also used for electrical contacts.
The element forms an alloy with osmium which is used for tipping pens and compass bearings.
Isotopes in Industry
Metallic 192Ir (with a half-life of 74 days) is used as a radiation source in gamma cameras for non-destructive testing of products for manufacturing flaws, such as aircraft parts, boilers, and pipeline welds (Fig. IUPAC.77.1) [274] P. Hayward, D. Currie. “Radiography of welds using seleniuim 75, Ir 192 and x-rays”, in Asia-Pacific Conference on NDT, Auckland, New Zealand (2006)..
Isotopes in Medicine
Metallic 192Ir is used in brachytherapy [188] S. J. Adelstein, F. J. Manning. Isotopes for Medicine and the Life Sciences, pp. 20–25, National Academy Press, Washington DC (1995)., [521] A. Talamo, Y. Gohar. Radioactive Isotope Production for Medical Applications Using Kharkov Electron Driven Subcritical Assembly Facility, ANL-07/18, Argonne National Laboratory Argonne, Illinois (2007)., [522] S. A. Buzdar, M. A. Gadhi, M. A. Rao, N. A. Laghari, M. Anees. J. Pak. Med. Assoc.59, 113 (2009)., [523] T. Genkaa, S. Iwamotoa, E. Juitab, N. Takeuchia. Nucl. Inst. Methods Phys. Res. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.369, 709 (1996).. 191mIr (with a half-life of 5 s) is used for blood flow imaging (angiography), especially in pediatric populations [524] K. J. Kairemo, M. S. Kestilä, S. Savolainen, O. A. Korhola, J. V. Hiltunen, R. I. Svahn, E. T. Korppi Tommola, F. F. Knapp, C. Brihaye. J. Nucl. Biol. Med.38, 86 (1994)., [525] S. T. Treves, A. B. Packard, L. C. T. Fung. J. Nucl. Med.45, 508 (2004).. The m in the superscript 191mIr indicates a metastable state of the isotope.
Isotopes Used as a Source of Radioactive Isotope(s)
Iridium consists of two stable isotopes (191Ir and 193Ir) from which the radioactive isotopes 192Ir and 195mPt (with a half-life of 4 days) can be produced. Both are used in nuclear medicine. The m in the superscript 195mPt indicates a metastable state of the isotope.
Iridium chemistry is dominated by coordination compounds and oxides rather than simple salts. Common oxidation states are +3 and +4, while lower and higher states occur in organometallic or strongly oxidizing systems. Iridium(IV) oxide, IrO₂, is an electrically conducting oxide used in dimensionally stable anodes and electrochemical research. Hexachloroiridic acid, H₂IrCl₆, and related chloroiridate salts are important refining and precursor compounds. The complex [Ir(ppy)₃] is a representative phosphorescent organoiridium emitter.
See more information at the Iridium compound page.
Massive iridium metal is chemically inert and has low acute toxicity, but finely divided powder can present dust and fire hazards. Soluble iridium salts and organoiridium compounds should be treated as potentially toxic because biological effects are compound-specific and incompletely characterized. The radionuclide ¹⁹²Ir emits penetrating gamma radiation and requires strict shielding and source control.
Iridium is extremely scarce in the crust and is usually dispersed with other platinum-group elements. Natural mobility is low because the metal and many of its minerals are resistant to weathering, although complexing ligands and industrial processing can mobilize small amounts. The sharp enrichment of iridium in some boundary clays is widely used as evidence for extraterrestrial material mixed into sediment.
Iridium is recovered chiefly as a by-product of platinum-group metal refining from nickel-copper sulfide ores and platinum placers. Supply is constrained by the production of the host metals, complex separation chemistry, and limited primary deposits. Demand is small but specialized, so substitution is possible in some electrical and catalytic uses but difficult in high-temperature crucibles and certain corrosion-resistant components. Recycling from spent electrodes, crucibles, and industrial scrap is important because the metal is rare and costly to replace.
Iridium occurs uncombined in nature with platinum and other metals of this family in alluvial deposits. It is recovered as a by-product from the nickel mining industry.
Iridium is a heavy r-process and s-process element made in late stellar evolution and explosive astrophysical environments. In the Solar System it is far more abundant in primitive meteorites than in Earth’s crust, because much of Earth’s original inventory partitioned into the core during differentiation. This siderophile behavior makes iridium a sensitive tracer of meteoritic input.
- Iridium is one of the densest elements, close to osmium in measured density.
- The name comes from Iris, reflecting the varied colors of some iridium salts.
- Iridium metal resists attack by aqua regia better than most noble metals.
- The Cretaceous-Paleogene boundary layer is enriched in iridium relative to ordinary crustal rocks.
- Iridium crucibles are used to grow some high-melting oxide crystals.
- Natural iridium consists mainly of the stable isotopes ¹⁹¹Ir and ¹⁹³Ir.
Imagens
Propriedades
Física
- Raio atômico (empírico)
- 135 pm Comparar Raio atômico (empírico) de todos os elementos →
- Raio covalente
- 141 pm Comparar Raio covalente de todos os elementos →
- Raio de van der Waals
- 202 pm Comparar Raio de van der Waals de todos os elementos →
- Raio metálico
- 127 pm Comparar Raio metálico de todos os elementos →
- Densidade
- 2,25622 × 104 kg/m³ Comparar Densidade de todos os elementos →
- Volume molar
- 0,00854 L/mol
- Fase nas CNTP
- Sólido Comparar Fase nas CNTP de todos os elementos →
- Ponto de fusão
- 2445,85 °C Comparar Ponto de fusão de todos os elementos →
- Ponto de ebulição
- 4427,85 °C Comparar Ponto de ebulição de todos os elementos →
- Condutividade térmica
- 147 W/(m·K) Comparar Condutividade térmica de todos os elementos →
- Capacidade calorífica específica
- 0,131 J/(g·K) Comparar Capacidade calorífica específica de todos os elementos →
- Capacidade calorífica molar
- 25,1 J/(mol·K) Comparar Capacidade calorífica molar de todos os elementos →
- Estrutura cristalina
- Cúbica de faces centradas Comparar Estrutura cristalina de todos os elementos →
Química
- Eletronegatividade (Pauling)
- 2,2 Comparar Eletronegatividade (Pauling) de todos os elementos →
- Eletronegatividade (Allen)
- 1,68
- Afinidade eletrônica
- 1,565 eV
- Energia de ionização (1ª)
- 8,96702 eV Comparar Energia de ionização (1ª) de todos os elementos →
- Energia de ionização (2ª)
- 17,000059 eV Comparar Energia de ionização (2ª) de todos os elementos →
- Energia de ionização (3ª)
- 28,000096 eV Comparar Energia de ionização (3ª) de todos os elementos →
- Energia de ionização (4ª)
- 40,000138 eV Comparar Energia de ionização (4ª) de todos os elementos →
- Energia de ionização (5ª)
- 57,000196 eV Comparar Energia de ionização (5ª) de todos os elementos →
- Estados de oxidação
- −3, −2, −1, +1, +2, +3, +4, +5, +6, +7, +8, +9 Comparar Estados de oxidação de todos os elementos →
- Elétrons de valência
- 9 Comparar Elétrons de valência de todos os elementos →
- Configuração eletrônica
- [Xe] 6s2 4f14 5d7
Termodinâmica
- Calor de fusão
- 0,27050837 eV Comparar Calor de fusão de todos os elementos →
- Calor de vaporização
- 6,26004 eV Comparar Calor de vaporização de todos os elementos →
- Calor de sublimação
- 6,944085 eV
- Calor de atomização
- 6,944085 eV
- Entalpia de atomização
- 6,93372 eV
Nuclear
- Prótons
- 77 Comparar Prótons de todos os elementos →
- Nêutrons
- 116 Comparar Nêutrons de todos os elementos →
- Isótopos conhecidos
- 43 Comparar Isótopos conhecidos de todos os elementos →
- Isótopos estáveis
- 2 Comparar Isótopos estáveis de todos os elementos →
- Isótopo mais estável
- Ir-193
- Ano da descoberta
- 1803
Abundância
- Abundância (crosta terrestre)
- 0,001 mg/kg Comparar Abundância (crosta terrestre) de todos os elementos →
Estrutura cristalina
- Constante de rede a
- 384 pm
Estrutura eletrônica
- Elétrons por camada
- 2, 8, 18, 32, 15, 2 Comparar Elétrons por camada de todos os elementos →
Identificadores
- Número CAS
- 7439-88-5 Comparar Número CAS de todos os elementos →
- Símbolo de termo
- 4F9/2
- InChI
- InChI=1S/Ir
- Chave InChI
- GKOZUEZYRPOHIO-UHFFFAOYSA-N
Configuração eletrônica Medido
Ir: 4f¹⁴ 5d⁷ 6s²[Xe] 4f¹⁴ 5d⁷ 6s²1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d⁷ 6s²Modelo atômico
Os isótopos alteram o número de nêutrons, a massa e a estabilidade — não a configuração eletrônica de um átomo neutro.
Modelo atômico esquemático, sem escala.
Assinatura atômica
Espectro de emissão / absorção
Distribuição isotópica
| Número de massa | Massa atômica (u) | Abundância natural | Meia-vida |
|---|---|---|---|
| 191 Estável | 190,9605893 ± 0,0000021 | 37,3000% | Estável |
| 193 Estável | 192,9629216 ± 0,0000021 | 62,7000% | Estável |
Fase / Estado
Motivo: 2420,8 °C abaixo do ponto de fusão (2445,85 °C)
Esquemático, sem escala
Pontos de transição de fase
Energias de transição
Energia necessária para fundir 1 mol no ponto de fusão
Energia necessária para vaporizar 1 mol no ponto de ebulição
Energia necessária para sublimar 1 mol no ponto de sublimação
Densidade
Em condições padrão
Em condições padrão
Espectros atômicos
Mostrando 10 de 77. Ordenado por carga do íon (ordem crescente).
Dados de linhas disponíveis ?
| Íon | Carga | Total de linhas | Probabilidades de transição | Designações dos níveis |
|---|---|---|---|---|
| Ir I | 0 | 402 | 70 | 398 |
| Ir II | +1 | 473 | 129 | 473 |
| Ir IV | +3 | 1374 | 1374 | 1374 |
Dados de níveis disponíveis ?
| Íon | Carga | Níveis |
|---|---|---|
| Ir I | 0 | 231 |
| Ir II | +1 | 76 |
| Ir III | +2 | 2 |
| Ir IV | +3 | 224 |
| Ir V | +4 | 2 |
| Ir VI | +5 | 2 |
| Ir VII | +6 | 2 |
| Ir VIII | +7 | 2 |
| Ir IX | +8 | 2 |
| Ir X | +9 | 2 |
Raios iônicos
| Carga | Coordenação | Spin | Raio |
|---|---|---|---|
| +3 | 6 | N/D | 68 pm |
| +4 | 6 | N/D | 62.5 pm |
| +5 | 6 | N/D | 56.99999999999999 pm |
Compostos
Isótopos (2)
| Número de massa | Massa atômica (u) | Abundância natural | Meia-vida | Modo de decaimento | |
|---|---|---|---|---|---|
| 191 Estável | 190,9605893 ± 0,0000021 | 37,3000% ± 0,2000% | Estável | stable | |
| 193 Estável | 192,9629216 ± 0,0000021 | 62,7000% ± 0,2000% | Estável | stable |
Linhas espectrais
| Comprimento de onda (nm) | Intensidade | Estágio de ionização | Tipo | Transição | Exatidão | Fonte | |
|---|---|---|---|---|---|---|---|
| 382.7577 nm | 58 | Ir II | emission | 5d7.(2D2).6s 3D → 5d7.(4F<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 384.593 nm | N/D | Ir II | emission | 5d7.(2G).6s 1G → 5d7.(4F<9/2>).6p (9/2,3/2)* | Medida | NIST | |
| 387.3624 nm | 9 | Ir II | emission | 5d6.6s2 5D → 5d7.(4P<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 389.558 nm | N/D | Ir II | emission | 5d6.6s2 5D → 5d7.(4F<7/2>).6p (7/2,1/2)* | Medida | NIST | |
| 395.1973 nm | N/D | Ir II | emission | 5d6.6s2 5D → 5d7.(4F<9/2>).6p (9/2,1/2)* | Medida | NIST | |
| 395.2882 nm | 8 | Ir II | emission | 5d7.(2H).6s 3H → 5d6.6s.(6D<9/2>).6p (9/2,1/2)* | Medida | NIST | |
| 397.882 nm | 6 | Ir II | emission | 5d7.(2F).6s 3F → 5664* | Medida | NIST | |
| 398.6377 nm | 5 | Ir II | emission | 5d6.6s2 5D → 5d7.(4F<3/2>).6p (3/2,1/2)* | Medida | NIST | |
| 399.0389 nm | 6 | Ir II | emission | 5d6.6s2 3H → 6197* | Medida | NIST | |
| 400.1961 nm | 12 | Ir II | emission | 5d7.(2D2).6s 3D → 5d7.(4P<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 402.5321 nm | 4 | Ir II | emission | 5d7.(2F).6s 3F → 5d6.6s.(6D<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 402.5399 nm | 29 | Ir II | emission | 5d7.(2D2).6s 3D → 5d7.(4F<7/2>).6p (7/2,1/2)* | Medida | NIST | |
| 404.1381 nm | 45 | Ir II | emission | 5d7.(2H).6s 3H → 5d7.(4F<9/2>).6p (9/2,1/2)* | Medida | NIST | |
| 404.4911 nm | 7 | Ir II | emission | 5d7.(2F).6s 3F → 5d7.(4F<9/2>).6p (9/2,3/2)* | Medida | NIST | |
| 410.8315 nm | 48 | Ir II | emission | 5d7.(2F).6s 3F → 5d7.(4F<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 411.7209 nm | 3 | Ir II | emission | 5d7.(2G).6s 3G → 5d7.(4F<9/2>).6p (9/2,1/2)* | Medida | NIST | |
| 412.8911 nm | 17 | Ir II | emission | 5d7.(2P).6s 3P → 5d7.(4P<1/2>).6p (1/2,1/2)* | Medida | NIST | |
| 413.91 nm | 21 | Ir II | emission | 5d7.(2P).6s 3P → 5d7.(4F<9/2>).6p (9/2,3/2)* | Medida | NIST | |
| 439.0196 nm | 4 | Ir II | emission | 5d6.6s2 5D → 5d7.(4P<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 443.3888 nm | N/D | Ir II | emission | 5d7.(2F).6s 3F → 5d6.6s.(6D<7/2>).6p (7/2,1/2)* | Medida | NIST | |
| 454.5672 nm | N/D | Ir II | emission | 5d7.(2H).6s 3H → 5d7.(4F<9/2>).6p (9/2,1/2)* | Medida | NIST | |
| 461.1752 nm | N/D | Ir II | emission | 5d7.(2F).6s 3F → 5d7.(4P<5/2>).6p (5/2,1/2)* | Medida | NIST | |
| 467.5844 nm | 5 | Ir II | emission | 5d7.(2G).6s 3G → 5d7.(4F<9/2>).6p (9/2,1/2)* | Medida | NIST | |
| 479.5262 nm | N/D | Ir II | emission | 5d6.6s2 5D → 5d7.(4F<9/2>).6p (9/2,1/2)* | Medida | NIST |
Propriedades ampliadas
Raios covalentes (dados ampliados)
- Raio covalente (Pyykkö)
- 122 pm
- Raio covalente (Pyykkö, ligação dupla)
- 115 pm
- Raio covalente (Pyykkö, ligação tripla)
- 107 pm
Raios de van der Waals
- Batsanov
- 200 pm
- Alvarez
- 241 pm
- UFF
- 284 pm
- MM3
- 236 pm
Raios atômicos e metálicos
- Raio atômico (Rahm)
- 240 pm
- Raio metálico (C12)
- 136 pm
Escalas de numeração
- Mendeleev
- 65
- Pettifor
- 65
- Glawe
- 62
Escalas de eletronegatividade
- Ghosh
- 0
- Miedema
- 6
- Gunnarsson–Lundqvist
- 6
- Robles–Bartolotti
- 6
Polarizabilidade e dispersão
- Polarizabilidade dipolar
- 54 a.u.
- Polarizabilidade dipolar (incerteza)
- 7 a.u.
- C₆ (Gould–Bučko)
- 522 Ha·Bohr6
Parâmetros de Miedema
- Volume molar de Miedema
- 8,52 cm3/mol
- Densidade eletrônica de Miedema
- 6
Risco de abastecimento e economia
- Concentração da produção
- 60
- Risco relativo de abastecimento
- 8
- Distribuição das reservas
- 95
- Estabilidade política (maior produtor)
- 44
- Estabilidade política (detentor das maiores reservas)
- 44
Transições de fase e alótropos
| Ponto de fusão | 2719,15 K |
| Ponto de ebulição | 4701,15 K |
Categorias de estados de oxidação
Dados de referência avançados
Constantes de blindagem (14)
| n | Orbital | σ |
|---|---|---|
| 1 | s | 1,4881 |
| 2 | p | 4,4624 |
| 2 | s | 20,1102 |
| 3 | d | 13,514 |
| 3 | p | 21,9311 |
| 3 | s | 22,7942 |
| 4 | d | 37,2628 |
| 4 | f | 38,6552 |
| 4 | p | 35,086 |
| 4 | s | 34,152 |
Detalhes dos raios cristalinos (3)
| Carga | CN | Spin | rcrystal (pm) | Origem |
|---|---|---|---|---|
| 3 | VI | 82 | estimated, | |
| 4 | VI | 76,5 | from r^3 vs V plots, | |
| 5 | VI | 71 | estimated, from metallic oxides, |
Modos de decaimento dos isótopos (64)
| Isótopo | Modo | Intensidade |
|---|---|---|
| 163 | p | — |
| 164 | p | — |
| 164 | A | — |
| 164 | B+ | — |
| 165 | p | — |
| 165 | A | — |
| 166 | A | 93% |
| 166 | p | 7% |
| 167 | A | 43,5% |
| 167 | p | 38,6% |
Fatores de espalhamento de raios X (515)
| Energia (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 2,22753 |
| 10,1617 | — | 2,30683 |
| 10,3261 | — | 2,38895 |
| 10,4931 | — | 2,474 |
| 10,6628 | — | 2,56207 |
| 10,8353 | — | 2,65417 |
| 11,0106 | — | 2,75003 |
| 11,1886 | — | 2,84935 |
| 11,3696 | — | 2,94781 |
| 11,5535 | — | 3,0118 |
Dados adicionais
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
1×10-3 milligrams per kilogram
Referências (1)
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
Not Applicable
Referências (1)
Sources
Sources of this element.
Iridium occurs uncombined in nature with platinum and other metals of this family in alluvial deposits. It is recovered as a by-product from the nickel mining industry.
Referências (1)
- [6] Iridium https://periodic.lanl.gov/77.shtml
Referências
(9)
Data deposited in or computed by PubChem
The half-life and atomic mass data was provided by the Atomic Mass Data Center at the International Atomic Energy Agency.
Element data are cited from the Atomic weights of the elements (an IUPAC Technical Report). The IUPAC periodic table of elements can be found at https://iupac.org/what-we-do/periodic-table-of-elements/. Additional information can be found within IUPAC publication doi:10.1515/pac-2015-0703 Copyright © 2020 International Union of Pure and Applied Chemistry.
The information are cited from Pure Appl. Chem. 2018; 90(12): 1833-2092, https://doi.org/10.1515/pac-2015-0703.
Thomas Jefferson National Accelerator Facility (Jefferson Lab) is one of 17 national laboratories funded by the U.S. Department of Energy. The lab's primary mission is to conduct basic research of the atom's nucleus using the lab's unique particle accelerator, known as the Continuous Electron Beam Accelerator Facility (CEBAF). For more information visit https://www.jlab.org/
The periodic table at the LANL (Los Alamos National Laboratory) contains basic element information together with the history, source, properties, use, handling and more. The provenance data may be found from the link under the source name.
The periodic table contains NIST's critically-evaluated data on atomic properties of the elements. The provenance data that include data for atomic spectroscopy, X-ray and gamma ray, radiation dosimetry, nuclear physics, and condensed matter physics may be found from the link under the source name. Ref: https://www.nist.gov/pml/atomic-spectra-database
This section provides all form of data related to element Iridium.
The element property data was retrieved from publications.