![]() ![]() The Kr-F bond energy is about 50 kJ mol −1, which is the lowest value of bond energy for chemical bonding formed by any element with fluorine. ![]() Krypton difluoride structureĪ liner KrF 2 has a similar structure to that of XeF 2 with the Kr-F bond distance of 189 pm. A mixture of KrF 2 and XeF 2 fluorinated many trivalent lanthanide compounds like LnF 4, LnF 7 − 3, and LnOF 2, where Ln = Ce, Pr, Nd, Tb, and Dy. KrF 2 uses a fluorinating agent that fluorinates xenon or noble metals like silver and gold. The chemical compound KrF 2 is less stable than XeF 2 and dissociated into Kr and F 2 at room temperature. It is also formed by the action of OF 2 on Kr in presence of sunlight. The rare gas compound, KrF 2 may be prepared by passing an electric discharge through a mixture of krypton and fluorine molecules at low pressure in a U-tube immersed with liquid oxygen. The only known unstable halide compound is krypton difluoride (KrF 2). The clathrates or cage compounds are formed mainly with water and para-quinol by trapping krypton molecules in the hydrogen bonding network. But it formed a few unstable chemical compounds with fluorine along with clathrates or cage compounds. The chemistry of krypton or other noble gases like helium, neon, and argon is different from other elements of the periodic table due to their filled valence shell configuration and high ionization energy. The radioactive isotopes 81Kr are used by dating ground water.85Kr (half-life 10.76 years) is prepared normally by nuclear fission of uranium and plutonium which is also emitted during the reprocessing of nuclear power reactors.78Kr (half-life 9.2×1021 years) is a stable isotope among all isotopes formed by radioactive decay reaction.It also formed about thirty-six unstable radioactive isotopes which are obtained by nuclear fission of uranium or any other nuclear reaction. Naturally occurring krypton has six isotopes like 84Kr (57 percent), 86Kr (17.3 percent), 82Kr (11.6 percent), 83Kr (11.5 percent), 80Kr (2.25 percent), and 78Kr (0.35 percent). Sir William Ramsay and Morris Travers in 1898 The rare gas, Kr has valence shell electron configuration 3d 10 4s 2 3p 6, and heat capacity ratio (Cp/Cv) close to 1.66. It occurs in the earth’s atmosphere to the extent of 0.0001 percent and is obtained by low-temperature distillation of liquid air. In solid-state, it forms a face-centered cubic crystal lattice, and the cubic close-packed structure is the most space-economizing. The electromagnetic spectrum analysis of Krypton is characterized by several sharp emissions of green and yellow lines in the spectrum. Travers and the name of the gas was derived from the Greek latter kryptos meaning hidden. Krypton was discovered in 1898 by the British chemists Sir William Ramsay and Morris W. It is placed in the p-block of the periodic table with group members helium, neon, argon, xenon, and radon. Due to the filled valence orbital, the oxidation number or state is zero but with fluorine, krypton shows a +2 oxidation state also. Krypton is a colorless, odorless, tasteless, monoatomic gas that forms a few numbers of chemical compounds with fluorine. ![]()
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