Noun Concept
Categories: Articles with short description, long volume value, Groups in the periodic table, Noble gases
noble gas  inert gas  argonon  noble gases  Helium family
The noble gases make up a class of chemical elements with similar properties; under standard conditions, they are all odorless, colorless, monatomic gases with very low chemical reactivity. Wikipedia
Historically called inert gas Wikipedia Disambiguation
Group of chemical elements in column 18 of the priodic 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 Wikidata
Any one of the monatomic gaseous elements forming group 18 (formerly group 0) of the periodic table. OmegaWiki
Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert. Wiktionary
Element of group 18 of the periodic table. Wiktionary (translation)