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Krypton

Krypton is a stable noble gas. It has an atomic number of 36. The name krypton comes from the Greek word kryptos meaning hidden. It is used in fluorescent lamps, flashbulbs, and as a wavelength standard. The metre used to be defined as 1,650,763.73 wavelengths in a vacuum of krypton gas.[1]

The Simple English Wiktionary has a definition for: krypton.
A discharge tube filled with Krypton
  1. ↑ "WebElements Periodic Table of the Elements". webelements.com. 2011. Retrieved 17 June 2011.

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