noble gases
group of chemical elements in column 18 of the periodic table, that tend to be chemically inert and thus form odorless, colorless, monatomic gases with low reactivity; consists of helium, neon, argon, krypton, xenon, radon, and possibly oganesson
en-GB/ˈnəʊbəl ˈɡæsɪz/
en-US/ˈnoʊbəl ˈɡæsɪz/