The term for a gas that doesn't interact with other substances in the chemical environment is known as an inert gas or noble gas. These gases, including helium, neon, argon, krypton, xenon, and radon, have a complete valence shell, making them chemically stable and unreactive under normal conditions. Their lack of chemical reactivity has a range of applications, such as in providing an unreactive atmosphere for certain chemical reactions, being used in lighting, and serving as cryogenic coolants. Noble gases are essential in various scientific and industrial applications because of these properties.