Krypton is a chemical element with the symbol Kr and atomic number 36. It is a noble gas, colorless, odorless, and tasteless, found in trace amounts in the Earth’s atmosphere. Krypton is chemically inert under most conditions but can form compounds with fluorine under extreme conditions. It is used in various applications, including lighting (e.g., krypton-filled light bulbs), photography (e.g., high-speed flash tubes), and in the production of certain types of lasers. In physics, krypton isotopes are also used in radiometric dating and as a reference in the definition of the meter based on the wavelength of its spectral lines.
