Any of the elements in-group O of regular dining table, including helium, neon, argon, krypton, xenon, and radon, which are monatomic sufficient reason for restricted exceptions chemically inert. Also known as inert gasoline.
some of the elements of team 18 associated with the periodic dining table, being monatomic and (with very limited exclusions) inert.
the chemically inert gaseous components of the helium team into the periodic dining table
a gaseous factor owned by team VIII regarding the regular table of elements, maybe not combining with other elements under normal reaction problems; especially, helium, neon, argon, krypton, xenon, or radon; also called inert fuel.