It is one of the products of the nuclear fission of uranium. This element is characterized by a brilliant green and orange spectral signature. Its melting point is 156.6☌, and its boiling point is 152.3☌. It is situated between argon and xenon in group 18 (former group 8A), and is placed after bromine in period four. As such, it is an extremely unreactive element.
#KRYPTON ELECTRON CONFIGURATION SERIES#
Krypton is a member of the noble gas series in the periodic table. Image of a krypton-filled discharge tube shaped like the element's atomic symbol. 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 seconds. (The bar was originally estimated to be one ten-millionth of a quadrant of the Earth's polar circumference.) Just 23 years later, the krypton-based standard was replaced by a measure of the speed of light-the most reliable constant in the universe.
This agreement replaced the longstanding standard meter located in Paris, which was a metal bar made of platinum- iridium alloy. In 1960, an international agreement defined the meter in terms of light emitted from a krypton isotope. They found it in the residue that remained after evaporating nearly all components of liquid air. Krypton ( Greek κρυπτός, meaning "hidden") was discovered in Great Britain in 1898 by Sir William Ramsay and Morris Travers. It can be extracted from liquid air by the technique known as fractional distillation. The concentration of krypton in earth's atmosphere is about one part per million (ppm). It is often used with other rare gases in fluorescent lamps. Krypton can also form "clathrates" (cage-like molecules) with water, when atoms of the element are trapped in a lattice of water molecules. Krypton is inert for most practical purposes, but it is known to form compounds with fluorine. It occurs in trace amounts in the atmosphere and is isolated by fractionating liquefied air. Krypton (chemical symbol Kr, atomic number 36) is a colorless, odorless, tasteless noble gas.
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