>> I think the fact it doesn't 'do anything' from our limited perception on  
>> matters makes it seem rarer, a bit like the fact that nitrogen forms a  
>> greater percentage of air then oxygen sometimes comes as a shock to people.
> 
> Isn't there a rare gas that seeps into the basements of houses in Cornwell and
> similar areas that is toxic?

http://en.wikipedia.org/wiki/Radon

Radioactive, not toxic. (It's a noble gas, after all...)

PS. Apparently there *are* compounds of Argon and gold, would you believe...

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