SEARCH Articles Figures Tables Argon-krypton mixed laser Compounds of argon, krypton and radon Group 18 . 5 Argon Helium Krypton Group 18 . 5 Argon Helium Krypton Neon Radon Xenon Krypton Kryptonates Noble Gases Argon Ar, Helium He, Krypton Kr, Neon Ne, and Xenon Xe The Noble Gases Helium, Neon, Argon, Krypton, Xenon