Xenonium

The xenonium ion, XeH⁺, is an onium compound, consisting of protonated xenon. Although the existence of the xenonium cation itself has not been proven, salts of the fluoroxenonium ion, XeF⁺, are known to exist, for instance fluoroxenonium pentafluoroplatinate (XeFPtF₅), more commonly known as xenon hexafluoroplatinate.^[1]

References

1. Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.