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5.323: 1.5 (4.155 × 10 16 kg) 914 – 1010: 4860 – 5390: 2020: SMM [39] [g] [an] 33: As: Arsenic: 5.776: 1.8 (4.986 × 10 16 kg) 0.999 – 1.31: 5.77 – 7.58: 2020: SMM [40] [g] [ao] 34: Se: Selenium: 4.809: 0.05 (1.385 × 10 15 kg) 21.4: 103: 2019: Preismonitor [20] [s] [ap] 35: Br: Bromine: 3.122: 2.4 (6.648 × 10 16 kg) 4.39: 13.7: 2019 ...
Xenon Xe 129 hyperpolarized, sold under the brand name Xenoview, is a hyperpolarized contrast agent indicated for use with magnetic resonance imaging (MRI) for evaluation of lung ventilation, and approved for people aged twelve years of age and older. [4] [5] It was approved for medical use in the US in December 2022. [6]
Naturally occurring xenon (54 Xe) consists of seven stable isotopes and two very long-lived isotopes. Double electron capture has been observed in 124 Xe (half-life 1.8 ± 0.5(stat) ± 0.1(sys) × 10 22 years) [2] and double beta decay in 136 Xe (half-life 2.165 ± 0.016(stat) ± 0.059(sys) × 10 21 years), [7] which are among the longest measured half-lives of all nuclides.
At standard temperature and pressure, pure xenon gas has a density of 5.894 kg/m 3, about 4.5 times the density of the Earth's atmosphere at sea level, 1.217 kg/m 3. [52] As a liquid, xenon has a density of up to 3.100 g/mL, with the density maximum occurring at the triple point. [ 53 ]
In addition to compounds where xenon forms a chemical bond, xenon can form clathrates—substances where xenon atoms or pairs are trapped by the crystalline lattice of another compound. One example is xenon hydrate (Xe· 5 + 3 ⁄ 4 H 2 O), where xenon atoms occupy vacancies in a lattice of water molecules. [32] This clathrate has a melting ...
Xenon isotope geochemistry uses the abundance of xenon (Xe) isotopes and total xenon to investigate how Xe has been generated, transported, fractionated, and distributed in planetary systems. Xe has nine stable or very long-lived isotopes. Radiogenic 129 Xe and fissiogenic 131,132,134,136 Xe isotopes are of special interest in geochemical ...
The xenonium ion, XeH +, is an onium compound, consisting of protonated xenon. Although the existence of the xenonium salts has not been proven, the isolated XeH + ion is known. [ 2 ] Salts of the fluoroxenonium ion, XeF + , are known to exist, for instance fluoroxenonium pentafluoroplatinate (XeFPtF 5 ), more commonly known as xenon ...
For argon only two estimations are available at room temperature. At a pressure of 2 atm, α 5 = 2.10 −6 cm 3 s −1 [149] and at a pressure of 1 atm, α 5 is 1 × 10 −6 cm 3 s −1. [65] Reaction (5) does not favor a transitory complex Rg XeCl * as an intermediate stage. [57] The following reaction, therefore, plays a minor role: Rg Xe ...