Xenon Hexafluoride is a thing. So it's only mostly non-reactive, and the effects don't necessarily have to be strictly from physical bulk. Apparently Krypton a

Xenon Hexafluoride is a thing. So it's only mostly non-reactive, and the effects don't necessarily have to be strictly from physical bulk. Apparently Krypton and Radon are slightly reactive as well: https://en.wikipedia.org/wiki/Noble_gas_compound https://en.wikipedia.org/wiki/Noble_gas_compound