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1. Iridium: Iridium is a chemical element with the symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is considered to be the second-densest naturally occurring metal (after osmium) with a ... (chemical element with atomic number 77) [100%] 2021-12-23 [Iridium] [Chemical elements]...
2. Iridium: Iridium is an element in the transition metals class of the periodic table. It is hard and lustrous, and is perhaps the most corrosion-resistant metal known. [100%] 2023-02-26 [Elements] [Metals]...
3. Iridium: Iridium, one of the metals of the platinum group, discovered in 1802 by Smithson Tennant during the examination of the residue left when platinum ores are dissolved in aqua regia; the element occurs in platinum ores in the form of ... [100%] 2022-09-02
4. Iridium: Iridium is a metallic element. It is a dense, very hard, brittle, silvery-white transition metal of the platinum group. [100%] 2023-01-30
5. Iridium: Iridium is a chemical element with the symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, iridium is considered to be the second-densest metal (after osmium) with a density of ... (Chemistry) [100%] 2023-08-26 [Iridium] [Chemical elements]...
6. Iridium: Iridium (chemical symbol Ir, atomic number 77) is a dense, hard, brittle, silvery-white transition metal of the platinum family. It occurs in natural alloys with platinum or osmium and is notable for being the most corrosion-resistant element known ... [100%] 2023-02-03
7. Iridium: Iridium es el nombre de una constelación de 66 satélites de comunicaciones que giran alrededor de la Tierra en 6 órbitas bajas LEO (Low Earth Orbit), a una altura aproximada de 780 km de la tierra. Cada una de las ... [100%] 2024-06-22
8. Iridium trihydride: Iridium trihydride (IrH3) is a chemical compound of iridium and hydrogen that can be formed under high pressure. The crystalline form has a distorted simple cubic structure. (Chemistry) [70%] 2023-05-29 [Iridium compounds] [Hydrides]...
9. Iridium 7: Iridium 7 was a United States Iridium communications satellite. It was launched into low Earth orbit from Vandenberg Air Force Base at 14:55 GMT on 5 May 1997, by a Delta II 7920-10C carrier rocket. (Engineering) [70%] 2022-05-27 [Iridium satellites]
10. Iridium tetroxide: Iridium tetroxide (IrO4, Iridium(VIII) oxide) is a binary compound of oxygen and iridium in oxidation state +8. This compound was formed by photochemical rearrangement of [(η-O2)IrO2] in solid argon at a temperature of 6 K (−267.15 °C ... (Chemistry) [70%] 2022-08-16 [Iridium compounds] [Transition metal oxides]...
11. Iridium acetylacetonate: Iridium acetylacetonate is the iridium coordination complex with the formula Ir(O2C5H7)3, which is sometimes known as Ir(acac)3. The molecule has D3-symmetry. [70%] 2022-12-12 [Iridium compounds] [Acetylacetonate complexes]...
12. Flash Iridium: Pour les articles homonymes, voir Iridium (homonymie). Un flash Iridium (en anglais Iridium flare) est un phénomène lumineux produit par la réflexion de la lumière du Soleil sur l'une des surfaces réfléchissantes (antennes ou parfois panneaux solaires) d'un ... [70%] 2023-09-24
13. Iridium compounds: Iridium compounds are compounds containing the element iridium (Ir). Iridium forms compounds in oxidation states between −3 and +9, but the most common oxidation states are +1, +3, and +4. (Chemistry) [70%] 2023-12-20 [Iridium] [Iridium compounds]...
14. Iridium Communications: Iridium Communications Inc. (formerly Iridium Satellite LLC) is a publicly traded United States company headquartered in McLean, Virginia. (Company) [70%] 2023-12-16 [Satellite telephony] [Satellite Internet access]...
15. Iridium anomaly: The term iridium anomaly commonly refers to an unusual abundance of the chemical element iridium in a layer of rock strata at the Cretaceous–Paleogene (K–Pg) boundary. The unusually high concentration of a rare metal like iridium is often ... (Thin layer of the element iridium in rock strata at the Cretaceous–Paleogene boundary) [70%] 2022-08-11 [Iridium] [Cretaceous–Paleogene boundary]...
16. Iridium disulfide: Iridium disulfide is the binary inorganic compound with the formula IrS2. Prepared by the direct reaction of the elements, the compound adopts the pyrite crystal structure at high pressure. (Chemistry) [70%] 2023-12-19 [Disulfides] [Iridium compounds]...
17. Iridium hexafluoride: Iridium hexafluoride, also iridium(VI) fluoride, (IrF6) is a compound of iridium and fluorine and one of the seventeen known binary hexafluorides. It is one of only a few compounds with iridium in the oxidation state +6. [70%] 2023-10-11 [Iridium compounds] [Hexafluorides]...
18. Iridium tetrafluoride: Iridium(IV) fluoride is a chemical compound of iridium and fluorine, with the chemical formula IrF4 and is a dark brown solid. Early reports of IrF4 prior to 1965 are questionable and appear to describe the compound IrF5. (Chemistry) [70%] 2023-08-16 [Iridium compounds] [Fluorides]...
19. Iridium 33: Iridium 33 was a communications satellite launched by Russia for Iridium Communications. It was launched into low Earth orbit from Site 81/23 at the Baikonur Cosmodrome at 01:36 UTC on 14 September 1997, by a Proton-K rocket ... (Engineering) [70%] 2023-07-24 [Satellites formerly orbiting Earth] [Iridium satellites]...
20. Iridium acetylacetonate: Iridium acetylacetonate is the iridium coordination complex with the formula Ir(O2C5H7)3, which is sometimes known as Ir(acac)3. The molecule has D3-symmetry. (Chemistry) [70%] 2023-06-02 [Iridium compounds] [Acetylacetonate complexes]...
21. Iridium anomaly: The term iridium anomaly commonly refers to an unusual abundance of the chemical element iridium in a layer of rock strata at the Cretaceous–Paleogene (K–Pg) boundary. The unusually high concentration of a rare metal like iridium is often ... (Chemistry) [70%] 2023-05-03 [Iridium]
22. Iridium Communications: Iridium Communications Inc. (formerly Iridium Satellite LLC) is a publicly traded American company headquartered in McLean, Virginia, United States. (American satellite communications company) [70%] 2024-01-19 [Iridium Communications] [Companies that filed for Chapter 11 bankruptcy in 1999]...
23. Iridium tetrachloride: Iridium tetrachloride is an inorganic compound with the approximate formula IrCl4(H2O)n. It is a water-soluble dark brown amorphous solid. (Chemistry) [70%] 2022-07-11 [Iridium compounds]
24. Iridium flare: An Iridium flare or satellite flare is a flash of light in the sky caused by sunlight reflected off an artificial satellite. More precisely, the term "Iridium flare" refers specifically to a flare produced by the first Iridium series of ... [70%] 2023-10-18 [Astronomy] [Ufology]...
25. Iridium 33: Iridium 33 was a communications satellite launched by Russia for Iridium Communications. It was launched into low Earth orbit from Site 81/23 at the Baikonur Cosmodrome at 01:36 UTC on 14 September 1997, by a Proton-K rocket ... (Communications satellite operated by Iridium Communications) [70%] 2022-12-30 [Communications satellites in low Earth orbit] [2009 in spaceflight]...
26. Iridium hexafluoride: Iridium hexafluoride, also iridium(VI) fluoride, (IrF6) is a compound of iridium and fluorine and one of the seventeen known binary hexafluorides. It is one of only a few compounds with iridium in the oxidation state +6. (Chemistry) [70%] 2023-10-07 [Iridium compounds] [Hexafluorides]...
27. Iridium 77: Iridium 77 was a communications Satellite which was part of a satellite constellation known as Iridium, named after the 77th chemical element of the periodic table, iridium. It was owned and funded by Iridium, a communications company. (Engineering) [70%] 2023-08-20 [Satellites orbiting Earth] [Iridium satellites]...
28. Iridium tetrachloride: Iridium tetrachloride is an inorganic compound with the approximate formula IrCl4(H2O)n. It is a water-soluble dark brown amorphous solid. [70%] 2023-11-08 [Iridium compounds] [Chloro complexes]...
29. Iridium trifluoride: Iridium trifluoride is a binary chemical compound of iridium and fluorine with the chemical formula IrF3. Reduction of iridium hexafluoride by metallic iridium: Decomposition of iridium tetrafluoride by heating at 430–450 °C: Iridium(III) fluoride forms black hexagonal crystals. (Chemistry) [70%] 2023-09-09 [Iridium compounds] [Fluorides]...
30. Iridium 7: Iridium 7 was a U.S. Iridium communications satellite. [70%] 2024-08-04 [Communications satellites in low Earth orbit] [Spacecraft launched in 1997]...