The term for a gas that does not react chemically with other substances is known as an inert gas or noble gas. Typically, these gases, which include helium, neon, argon, krypton, xenon, and radon, possess complete electron shells and are therefore highly stable. Their lack of reactivity makes them useful in a variety of applications, such as lighting and providing an unreactive atmosphere for chemical reactions. Inert gases play a critical role in both scientific research and industrial processes.