They have a face-centered cubic structure where krypton octahedra are surrounded by randomly oriented hydrogen molecules. Krypton's concentration in the atmosphere is about 1 ppm. It can be extracted from liquid air by fractional distillation. The first measurements suggest an abundance of krypton in space.
The periodic table of the elements
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Krypton atomic number 36, symbol Kr is a chemical element and a tasteless, odorless, and colorless noble gas, which is inert. It is characterized by several spectral signatures or sharp emission lines, and the strongest of them are yellow and green. Krypton has 30 isomers and unstable isotopes and 6 stable isotopes. One of them, Kr occurs with other isotopes of the element and is created as a result of atmospheric reactions. Due to its radioactivity, the half-life of krypton is , years.
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Krypton[ edit ] Radioactive krypton is the product of reactions with cosmic rays that strike the atmosphere, along with the six stable or nearly stable krypton isotopes. Krypton has been used for dating old 50, to ,year-old groundwater. This isotope is produced by the nuclear fission of uranium and plutonium in nuclear weapons testing and in nuclear reactors , as well as by cosmic rays.