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Iridium is a chemical element; it has symbol Ir and atomic number 77. A very hard, brittle, silvery-white transition metal of the platinum group, it is considered the second-densest naturally occurring metal (after osmium) with a density of 22.56 g/cm 3 (0.815 lb/cu in) [8] as defined by experimental X-ray crystallography. [a] 191 Ir and 193 Ir ...
The type locality of this iridium anomaly is near Raton, New Mexico. [1] [2]Iridium is a very rare element in the Earth's crust, but is found in anomalously high concentrations (around 100 times greater than normal) in a thin worldwide layer of clay marking the boundary between the Cretaceous and Paleogene periods, 66 million years ago.
The Cretaceous–Paleogene (K–Pg) boundary, formerly known as the Cretaceous–Tertiary (K–T) boundary, [a] is a geological signature, usually a thin band of rock containing much more iridium than other bands. The K–Pg boundary marks the end of the Cretaceous Period, the last period of the Mesozoic Era, and marks the beginning of the ...
Well-characterized compounds containing iridium in the +6 oxidation state include IrF6 and the oxides Sr2MgIrO6 and Sr2CaIrO6. [2][3] iridium (VIII) oxide (IrO4) was generated under matrix isolation conditions at 6 K in argon. [4] The highest oxidation state (+9), which is also the highest recorded for any element, is found in gaseous [IrO4]+.
Osmium (from Ancient Greek ὀσμή (osmḗ) 'smell') is a chemical element; it has symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element. When experimentally measured using ...
First-generation Iridium satellite. Antennas can be seen in front, and solar panels in the back. The first generation of the Iridium constellation launched a total of 95 telecommunication satellites in low Earth orbit which were known to cause Iridium flares, the brightest flares of all orbiting satellites, starting in 1997. From 2017 to 2019 ...
Iridium tetrachloride. Iridium tetrafluoride. Iridium trifluoride. Iridium trihydride. Iridium (II) chloride. Iridium (III) bromide. Iridium (III) chloride. Iridium (III) iodide. Iridium (III) sulfide.
Iridium Communications (NAS: IRDM) is expected to report Q2 earnings on Aug. 2. Here's what Wall Street wants to see. The 10-second takeawayComparing the upcoming quarter with the prior-year ...