The krypton (or crypt, or crypt, from the Greek κρυπτός -ή -όν "kryptòs -è -òn", meaning: hidden) is the chemical element of atomic number 36. Its symbol is Kr. It belongs to the group of noble gases , Is colorless and is present in traces in the atmosphere, from which it is isolated by fractional distillation of liquid air. It is used with other inert gases in fluorescence lamps.
From a practical point of view, krypton is chemically inert, however some of its compounds with fluorine are known. It can also form clotted with water when some of its atoms are trapped in the crystalline lattice formed by the molecules of the latter.
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