Rare Gases Krypton, Neon, Xenon

Latent heat of vaporization at boiling point Latent heat of fusion 46.2 Btu/lb 107.5 kJ/kg 

Weight of the liquid at boiling point Density of the liquid at boiling point Gas/liquid volume ratio (liquid at boiling point, gas at 70°F and 1 atm, vol/vol) 

Gas/liquid volume ratio (liquid at boiling point, gas at 

Chemical formula Molecular weight Density of the gas at 70°F (21.1°C) and 1 atm Specific gravity of the gas at 70°F and 1 atm (air = 1) Specific volume of the gas at 70°F (21.1°C) and 1 atm Boiling point at 1 atm Melting point at 1 atm Critical temperature Critical pressure Critical density Triple point 

Krypton, neon, and xenon are rare atmospheric gases. Each is odorless, colorless, tasteless, nontoxic, monatomic, and chemically inert. All three together constitute less than 0.002 percent of the atmosphere, with approximate concentrations in the atmosphere of 18 ppm for neon, 1.1 ppm for krypton, and 0.09 ppm for xenon. Few users of the three gases need them in bulk quantities, and the three are shipped most often in single cylinders and glass liter flasks. 

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Rare Gases Krypton, Neon, Xenon Silane... 

The molal diamagnetic susceptibilities of rare gas atoms and a number of monatomic ions obtained by the use of equation (34) are given in Table IV. The values for the hydrogen-like atoms and ions are accurate, since here the screening constant is zero. It was found necessary to take into consideration in all cases except the neon (and helium) structure not only the outermost electron shell but also the next inner shell, whose contribution is for argon 5 per cent., for krypton 12 per cent., and for xenon 20 per cent, of the total. 

Fig. 3.6. The spectral moment y as function of the product of densities, for various rare-gas mixtures at room temperature only one density was varied for each system the neon densities were fixed at 77, 31 and 46.5 amagats for the neon-argon, neon-krypton and neon-xenon mixtures, respectively and the krypton and xenon densities were fixed at 152 and 50 amagats, respectively, in their mixtures with argon. The departures from the straight lines seen at intermediate densities squared indicate the presence of many-body interactions. Reprinted with permission by Pergamon Press from [329].

RARE GAS. Any of the six gases composing the extreme right-hand group of the periodic table, namely helium, neon, argon, krypton, xenon, and radon. They are preferably called noble gases or (less accurately) inert gases. The first three have a valence of 0 and are truly inert, but the others can form compounds to a limited extent,... 

A common result of all the experiments is that most molecules quench the alkali resonance radiation very effectively with total cross sections ranging from 10 A2 to over 200 A2. However, if the molecule BC is replaced by a rare-gas atom, the quenching cross sections become very small at thermal energies. They are probably below 10 2 A2 for quenching by helium, neon, argon, krypton, and xenon.55 The latter result is easily understood in terms of Massey s adiabatic criterion.67 If Ar is a characteristic interaction range, v the impact velocity, and AE the energy difference between initial and final electronic states E(3p) and E(3s), respectively, then we must have a Massey parameter... 

These observations are qualitatively in agreement with the predictions from the TDSF theory however, a direct comparison between theory and experiment has not yet been made for the heavier rare gases. This delay prediction was validated by the observations by Burgers [7] in irradiated neon, where the production of neutral excited states were delayed with respect to the formation of excited ions. Cooper and Sauer [9] used a picosecond pulse radiolysis technique to investigate the formation and decay kinetics of several Ip states in the four rare gases neon, argon, krypton and xenon at low gas pressures (< 5 Torr). They found that all these states had delayed formation. 

The cold sample gas flows at 1001/min into a 0.2-1 charcoal trap that is cooled to -90°C to adsorb radon. Xenon flows through the trap and is then collected on the 2-1 main charcoal trap at -120°C. Nitrogen, oxygen, and the lighter rare gases helium, neon, argon, and krypton pass through this trap. 

Argon (Ar) gas, for example, is over 30 times more abundant than carbon dioxide and, therefore, not rare. And xenon is not inert it s first compounds were created in 1962. When xenon (Xe) forms binary fluorides and oxides as well as fluoride complexes and oxoanions, the stability of these compounds is very low. It s reactivity is related to increasing atomic size as you go down the table, which leads to a decrease in the first ionization potentials. Xenon tetraflouride (XeF,) is made by mixing one part xenon gas to three parts fluorine gas in a container at 400 °C. Compounds have been confirmed for argon (HArF), krypton (KrF2), xenon (numerous fluorides, oxyfluorides, and oxides), and radon (RnF2). It s believed that compounds exist with helium and neon as well, though none have been experimentally proven to date. 

Rare gas Gases such as argon, helium, neon, krypton, and xenon. 

Noble gas (1902) n. A member of group 0 in the periodic table. Any of a group of rare gases that include hehum, neon, argon, krypton, xenon, and sometimes radon and that exhibit great stability and extremely low reaction rates. 

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