The elements of Group 18 have been called the “noble gases”, “the inert gases” and “the rare gases”. Both are misnomers, since the discovery of the xenon fluorides in 1962 shows that xenon is not inert, and argon makes up 0.9% by volume of the atmosphere. Read the full article here https://gulpmatrix.com/the-electronic-structure-and-uses-of-the-noble-gases/