![]() ArKr+ and Kr H+ molecule- ions have been investigated and there is evidence for Kr Xe or KrXe+. Other fluorides and a salt of a krypton oxoacid have also been found. However, following the first successful synthesis of xenon compounds in 1962, synthesis of krypton difluoride was reported in 1963. Like the other noble gases, krypton is chemically inert. The first measurements suggest an overabundance of krypton in space. The amount of krypton in space is uncertain, as is the amount is derived from the meteoritic activity and that from solar winds. It can be extracted from liquid air by fractional distillation. The concentration of krypton in earth's atmosphere is about 1 ppm. In October 1983, the Bureau International des Poids et Mesures (International Bureau of Weights and Measures) defined the meter as the distance that light travels in a vacuum during 1/299,792,458 s. This agreement replaced the longstanding standard meter located in Paris, which was a metal bar made of a platinum- iridium alloy (the bar was originally estimated to be one ten-millionth of a quadrant of the earth's polar circumference), and was itself replaced by a definition based on the speed of light - a fundamental physical constant. In 1960, an international agreement defined the meter in terms of wavelength of light emitted by the krypton-86 isotope. William Ramsay was awarded the 1904 Nobel Prize in Chemistry for discovery of a series of noble gases, including krypton. Krypton (Greek κρυπτόν, kryptos meaning "hidden") was discovered in Great Britain in 1898 by Sir William Ramsay and Morris Travers in residue left from evaporating nearly all components of liquid air. The original name of krypton is "Hidden One." The melting point of krypton is -157.2 degrees Celsius, and its boiling point is -152.9 degrees Celsius. Solidified krypton is white and crystalline with a face-centered cubic crystal structure, which is a common property of all noble gases. It is one of the products of uranium fission. Krypton is characterized by a brilliant green and orange spectral signature. Krypton has an important role in production and usage of the krypton fluoride laser. It, as well as all other noble gases, can be used in lighting and photography. Krypton can also form clathrates with water when atoms of it are trapped in a lattice of the water molecules.įrom 1960 to 1983, the distance of the meter was defined in terms of the orange-red spectral line of krypton-86, an isotope of krypton. Krypton is inert for most practical purposes, but it is known to form compounds with fluorine. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquified air, and is often used with other rare gases in fluorescent lamps. Krypton ( pronounced /ˈkrɪptən/ or /ˈkrɪptɒn/) is a chemical element with the symbol Kr and atomic number 36.
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