Which inert gas is present in the atomspheric air in negligible quantity?
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there are in fact quite a few noble gases in dry air including argon, xenon, helium, kryton and neon. Here is list of all gases in dry air along with their respective concentrations: (noble gases:
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Argon is the most abundant and most used of the noble gases. Its chief uses are in metallurgy, where it provides an inert atmosphere in which hot metals can be worked. Because argon is so very unreactive, it prevents chemical reactions of the very hot metal being welded or forged.
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