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{{Element | name=Krypton| symbol=Kr | anumber=36 | amass=83.8 amu | noe=36 | class=Noble Gas | cstructure=Cubic | color=Colorless | date=1898 | discname= Sir [[William Ramsay]] | origname=From the Greek word ''kryptos'' (hidden) | uses=Lighting | obtained=Production of liquid air}}
{{Element | name=Krypton| symbol=Kr | anumber=36 | amass=83.8 amu | noe=36 | class=Noble Gas | cstructure=Face-centered cubic | color=Colorless | date=1898 | discname= Sir [[William Ramsay]] and M. W. Travers | origname=From the Greek word ''kryptos'' (hidden) | uses=Lighting and scientific standards | obtained=Production of liquid air}}
'''Krypton''' is an [[element]] in the "[[noble gas]]" class (or "inert gas") of the [[periodic table of the elements|periodic table]]. It is colorless and odorless. It is almost (but not completely) chemically inert. It has six stable isotopes.
It is noteworthy in that one of its spectral lines is used as the official scientific definition of length—1 meter is 1650763.73 wavelengths. (Prior to that, the meter was defined as the distance between two lines scratched on the "International Standard Meter stick".)