random gas question

[Sisyphus]

What's the biggest molecule you can think of that forms a gas at standard temperature and pressure? Or, what's the densest possible gas at STP?

[JesuBungle]

Radon? Idk, I forgot my chemistry a long time ago. But that would be my guess.

[Sisyphus]

That's the heaviest pure element that's a gas, yeah, but I was wondering about compounds.

[Gilded]

The densest gas is probably sulfur hexafluoride, and the molecule is pretty big too.

[swansont]

The densest gas is probably sulfur hexafluoride, and the molecule is pretty big too.

 

 

SF₆'s density is about 6.3 g/L (http://encyclopedia.airliquide.com/Encyclopedia.asp?GasID=34 gives its value at conditions slightly different than STP)

 

Radon's density is almost 10g/L