Word

inert gas, n.

any of the chemically inert gaseous elements of the helium group in the periodic table
<noun.substance>

argonon inert gas noble gas

semantic pointers

hypernym

element, chemical element gas

hyponym

argon, Ar, atomic number 18 helium, He, atomic number 2 krypton, Kr, atomic number 36 neon, Ne, atomic number 10 radon, Rn, atomic number 86 xenon, Xe, atomic number 54