What are noble gases? July 26, 2020 by Pamela Landy The term noble gas refers to the lack of chemical reactivity in these inert gases. For the record, there are six noble gases: helium, neon, argon, krypton, xenon, and radon. Related Answers What does the term plasma mean to a physician? How much is the human body worth? When was the LP invented? What was known as the “Noble Experiment” in 1920? How cold was it at Valley Forge in the winter of 1777?