Argon chemical inertness

Argon is frequently used for the determination of surface area, usually at 77 K. Like the other noble gases, argon is of course chemically inert and is composed of spherically symmetrical monatomic molecules. Argon stands in... 

Argon is a colorless, odorless, tasteless, chemically inert noble gas that makes up about 0.93% of the Earths atmosphere. It is the third most abundant gas in the atmosphere, meaning it is more common than carbon dioxide, helium, methane, and hydrogen. 

Although argon is considered chemically inert, at low temperatures it is possible to combine argon with other atoms to form very fragile compounds, which exist only at those very low temperatures. For instance, it can combine with fluorine and hydrogen to form argon fluorohydride (HArF). It is only slightly soluble in water. 

Argon is a better screener than helium because it has more electrons. It has been pointed out previously that the melting temperature and the phase transitions of solids can be changed by molecules which are screeners and which cannot possibly form chemical bonds except by extending van der Waals forces. This poses the problem of whether even chemically inert gases can affect the reactivity of solids. 

The chemical inertness of argon has been demonstrated by even more tests than were used in the case of helium. The results are all clearly negative with the possible exception of the effect of the silent electric discharge upon a mixture of argon with volatile aromatic compounds.1 Argon was absorbed under these conditions, but there is no evidence of the formation of any compounds. 

Noble gases (Section 1.1) The elements in group VlllA of the periodic table (helium, neon, argon, krypton, xenon, radon). Also known as the rare gases, they are, with few exceptions, chemically inert. 

As viewed from the top, the plasma has a circular, doughnut shape. The sample is injected as an aerosol through the centre of the doughnut. This characteristic of the source confines the sample to a narrow region and provides an optically thin emission source and a chemically inert atmosphere. Normally, samples are introduced as a solution into the plasma and argon is used as a carrier gas for the sample introduction. The much higher temperatures of the plasma compared to flame make ICP-AES more effective in detecting lower concentrations of refractory elements such as Ta, W and Zr, and rare earth elements. 

Separation occurs as the vapor constituents equilibrate between carrier gas and the stationary phase. The carrier gas is a chemically inert gas available in pure form such as argon, helium, or nitrogen. A highly dense gas gives best efficiency since diffusivity is lower, but a low-density gas gives faster speed. The choice of gas is often dictated by the type of detector. 

DOS, Argon. Ar at. wt 39,948 at- no. 18. Three stable isotopes 36 (0.337%) 38 (0.063%) 40 (99.600%) artificial, radioactive isotopesr 33 35. 37 39 4] 42. Abundance in earth s crust 4 X 10 % concentration in the atmosphere 0.93% by vol cosmic abundance 1.5 X 10 atom M0 atoms of Si. Elemental, monoatomic, gaseous constituent Of air, discovered by Rayleigh and Ramsay in 1894. Although molecular ions, hydrates and cl at h rates of argon have been observed, it should be considered a noble , chemically inert gas, due to its electronic structure. The outer p subshell is entirely filled ls22s42p63s23p6. Obtained commercially... 

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