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I heard that the most difficult compound to produce was a molecule that included Argon because it is a noble gas. I was wondering how long it was stable for.

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closed as primarily opinion-based by NotEvans., Wildcat, Jan, Klaus-Dieter Warzecha, Jon Custer Aug 30 '16 at 12:58

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ *coughs*Maitotoxin*coughs* $\endgroup$ – Jan Aug 30 '16 at 9:42
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    $\begingroup$ @Jan.. just a few more months ;) $\endgroup$ – NotEvans. Aug 30 '16 at 17:26
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There is no such thing as the most difficult compound to produce. Instead, there are some hundreds of thousands of "stable" compounds of which we know pretty much everything - melting point, boiling point, heat capacity over a wide range of temperatures, refractive index, speed of sound, magnetic susceptibility, electrical conductivity, crystal structure, and many more. Around that field is a much wider "grey zone" of the not-so-stable compounds (millions of them), which miss some of these properties because they can't be measured.

As we reach out to the far outskirts of that zone, we meet more and more compounds with less and less known properties in each one, because they are increasingly frail and short-lived, to the point that the very words "produce" or "synthesize" (or even "exist", for that matter) do not quite apply to them anymore. Some of them last but a fraction of second; some live longer, but require very peculiar conditions. There is absolutely no meaningful way to arrange them in order of increasing "difficulty".

Also, welcome to Chem.SE.

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