Response last updated by CmdrK on Sep 06 2016.
May 12 2013, 1:27 AM
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Upstart3 11 year member
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The question was about molecules though
May 12 2013, 4:27 AM
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looney_tunes Moderator 18 year member
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Currently voted the best answer.
Helium is a monatomic molecule, so a legitimate answer to the question. If the question intended to ask about the noble gas compound with the most stable molecule, then xenon hexafluoride is the answer.