Radon is the heaviest of noble gases (222 g/mol). The heaviest gas at room temperature ( 75º F, 293.15º K) is WF6, or Tungsten Hexafluoride (297.83 g/mol, that's about 10 times heavier than air!). It changes phase (becomes liquid) at 290.25...
http://wiki.answers.com/Q/What_is_the_name_of_the_heavi...
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Radon (Rn) is the heaviest noble gas - it has an atomic weight of 222.
http://wiki.answers.com/Q/What_is_the_heaviest_noble_ga...
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Summary: The heaviest noble gas, and the most dense gas known. Many isotopes of Radon are formed by breakdown of radioactive elements in the ground, and are radioactive themselves. Radon can build up in unventilated areas, such as mines (especially uranium mines) and basements.
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www.concentric.net/~Noshadow/table/Rn.shtml
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We challenge the popular concept of a noble gas 'subduction barrier'—the convecting mantle noble gas isotopic and elemental composition is explained by subduction of sediment and seawater-dominated pore fluids. This accounts for 100% of the non-radiogenic argon and krypton and 80% of the xenon.
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www.nature.com/doifinder/10.1038/nature04761
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We challenge the popular concept of a noble gas 'subduction barrier'—the convecting mantle noble gas isotopic and elemental composition is explained by subduction of sediment and seawater-dominated pore fluids. This accounts for 100% of the non-radiogenic argon and krypton and 80% of the xenon.
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www.nature.com/nature/journal/v441/n7090/abs/nature0476...
www.nature.com/nature/journal/v441/n7090/abs/nature04761.html
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A selection of articles related to noble gas ... A Wisdom Archive on noble gas ... Essentially chemically inert, but radioactive, radon is the heaviest noble gas and one of the heaviest gases at room temperature.
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www.experiencefestival.com/noble_gas/page/2
www.experiencefestival.com/noble_gas/page/2
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Breathing Xenon:Xenon is the heaviest non-radioactive noble gas (5x density of air) and is used for ion thrusters, general anesthetic, and various types of l... ... "These are the heaviest of the inert gases, and have some peculiarities. Xenon is, amazingly, ... no, xenon is a noble gas. Its pretty much completely inert.
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youtube.com/watch?v=hwnLiXK-v5U&feature=user
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atomic number 86, radon, Rn - a radioactive gaseous element formed by the disintegration of radium; the heaviest of the inert gasses; occurs naturally (especially in areas over granite) and is considered a hazard to health ... noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table...
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www.thefreedictionary.com/noble+gas
www.thefreedictionary.com/noble+gas
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Test your knowledge of this set of lazy elements... and enjoy! - trivia quiz game. Play now! ... 6. Which noble gas is formed as a result of the decay of the radioactive elements uranium and radium? The gas itself is also radioactive, and is the heaviest of all the noble gases.
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www.funtrivia.com/playquiz/quiz1410931028e60.html
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