![]() Other fluorides and a salt of a krypton oxoacid have also been found. Following the first successful synthesis of xenon compounds in 1962, synthesis of krypton di fluoride was reported in 1963. Like the other noble gases, krypton is widely considered to be chemically inert. 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 metre as the distance that light travels in a vacuum during 1/299,792,458 s. But only 23 years later, the Krypton-based standard was replaced itself by the speed of light-the most reliable constant in the universe. This agreement replaced the longstanding standard metre 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). In 1960 an international agreement defined the metre in terms of light emitted from a krypton isotope. Krypton ( Greek κρυπτός meaning "hidden") was discovered in Great Britain, 1898 by Sir William Ramsay and Morris Travers in residue left from evaporating nearly all components of liquid air. Solidified krypton is white and crystalline with a face-centered cubic crystal structure which is a common property of all "rare gases". It is one of the products of uranium fission. Krypton, a noble gas due to its very low chemical reactivity, is characterized by a brilliant green and orange spectral signature. Image of a krypton filled discharge tube shaped like the element's atomic symbol. Krypton can also form clathrates with water when atoms of it are trapped in a lattice of the water molecules. 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 fractionating liquefied air, and is often used with other rare gases in fluorescent lamps. Krypton ( IPA: /ˈkrɪptən/ or /ˈkrɪptan/) is a chemical element with the symbol Kr and atomic number 36. ![]()
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