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Of the simple elemental gases, Astatine may have the highest density. An awkward material to work with, but it is likely to evaporate from its self heating due to its radioactivity. Perhaps less is known of this element than any other.

Otherwise, the usual halide group (Cl, Br, F, etc.) have great densities, and perhaps evaporated iodine would be high on the list.

For non-elemental gases, there will be some unusual pentachlorides or pentafluorides, usually used as liquids in mineral separation. regret not being able to be more specific.

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Q: What gas has the highest specific gravity?
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