Element 36 is known as Krypton, a noble gas found in group 18 of the periodic table. It has the atomic number 36 and is colorless, odorless, and tasteless under standard conditions. Krypton is primarily used in lighting applications, such as fluorescent lamps and high-performance light bulbs, due to its ability to produce bright white light when electrically excited. Krypton occurs naturally in the Earth's atmosphere in trace amounts, making up about 1 part per million. It was discovered in 1898 by William Ramsay and Morris Travers while they were studying the residue left after evaporating liquid air. Krypton is also used in some types of lasers and in the production of insulated windows for improved energy efficiency.