Ädelgaser, or noble gases, are a group of chemical elements found in group 18 of the periodic table. This group includes helium, neon, argon, krypton, xenon, and radon. They are characterized by their lack of reactivity due to having a full outer electron shell, which makes them stable and unlikely to form compounds with other elements. These gases are colorless, odorless, and tasteless at room temperature. They are commonly used in various applications, such as neon lights for advertising, argon in welding, and xenon in high-intensity lamps. Their unique properties make them valuable in both scientific and industrial fields.