For 10 points, name this group of gases that includes radon, xenon, krypton, argon, neon, and helium.
The electron affinity is negative for the elements, and these elements can form endohedral complexes when one of their atoms gets trapped inside a fullerene. These elements were initially omitted from the periodic table by Dmitri Mendeleyev until William Ramsay discovered three of these elements. These elements constitute Group 18, and since they have completely filled outer electron shells, they are very unreactive. For 10 points, name this group of gases that includes radon, xenon, krypton, argon, neon, and helium.
The electron affinity is negative for the elements, and these elements can form endohedral complexes when one of their atoms gets trapped inside a fullerene.
{noble} gas es or {inert gases}