Krypton occurrence

The hydrogen atom orbitals give us the numbers 2, 8, 18, and 32—the numbers we find separating the specially stable electron populations of the inert gases. It was necessary to multiply n2 by two—an important factor that could not have been anticipated. Furthermore, it will be necessary to find an explanation for the occurrence of eight-electron differences both at neon and at argon and eighteen-electron differences both at krypton and at xenon. 

The photolysis of pure methane in the solid phase and of methane in argon or krypton matrices has been examined by Ausloos et at 1236 A. The photolysis of solid methane is very similar to the gas-phase photolysis. Hydrogen and ethane are the major products, with CH4-CD4 mixtures showing an H2 and D2 richness over HD, and a predominance of d, d, d and rfg fractions in ethane. These features are indicative of molecular elimination of hydrogen followed by insertion of CH2 into methane. It was found that the smaller but significant contribution of ethane- s was greater than that of either ethane- i or d. This has been interpreted as evidence for the primary photolysis of methane into a hydrogen atom and a methyl radical. The fact that little ethane- i or is found excludes the formation of the methyl radicals by the dissociation of a hot ethane molecule after insertion by CH2. The minor products of photolysis are ethylene, propane, butanes, propene and pentanes. The presence of ethylene-[Pg.68]

Occurrence.Krypton is found in the atmosphere in the proportion of ala ait. 1 part in 2tUKHMXK>. It is present in slightly larger amounts in the gases evolved from certain mineral springs. 

Occurrence, extraction and uses Physical properties Compounds of xenon Compounds of krypton and radon... 

A second example of the occurrence in nature of materials in elemental form is air, which may be physically separated into its component gases by liquefaction and fractional distillation. In this way substantial amounts of nitrogen and oxygen, plus small amounts of the inert gases argon, neon, krypton, and xenon are produced. A recent development has been the use of zeolites (p. 323) for carrying out this separation. 

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