| Like the other noble gases, krypton is chemically inert. However, following the first successful synthesis of xenon compounds in 1962, synthesis of krypton difluoride was reported in 1963. Other fluorides and a salt of a krypton oxoacid
have also been found. ArKr+ and KrH+ molecule-ions have been investigated and there is evidence for KrXe or KrXe+. At the University of Helsinki in Finland, HKrCN and HKrCCH (krypton hydride-cyanide and hydrokryptoacetylene) were synthesized
and determined to be stable up to 40K.
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