Kryptonium ion

The kryptonium ion, KrH⁺, is an onium ion, consisting of protonated krypton. Although the existence of the kryptonium cation itself has not been proven, salts of the fluorokryptonium ion, KrF⁺, are known to exist.[1]

Not to be confused with kryptonium.

References

1. Lehmann, J (2002). "The chemistry of krypton". Coordination Chemistry Reviews. 233-234: 1. doi:10.1016/S0010-8545(02)00202-3.