Krypton

See also: Krypton (homonymy)

The krypton is a chemical element, of symbol Kr and Atomic number 36.

Krypton was discovered by Sir William Ramsay and Morris William Through in 1898.

Etymology of the name: from the Greek kryptos (" comes; caché").
He belongs to the group of the “rare gases” with the Hélium, the Néon, the Argon, the Xénon, and the Radon.

Properties

Chemically inert, it reacts only with the Fluor to form krypton difluorure (KrF2), only known compound.

With room temperature, krypton is a gas without color, odorless and rather expensive (10 times less than xenon however). It is one of the by-products of the nuclear plants.

One of its physical properties, the transition between the levels 2p10 and 5d5, was used to define the meter until in 1983: 1.650.763, 73 wavelengths in the vacuum of the Spectral line orange of 86Kr.

Use

Krypton is expensive, it is thus used with parsimony; one prefers to him the Argon, much less expensive like inert Gaz, for certain weldings.
  • Like Gas of filling in the lamps incandescent.
  • electric Applications: the krypton lamps produce a light of high intensity with one long life of life,
  • double glazing: krypton is used with argon in filling to increase the thermo isolation.
  • Laser: krypton is used in the laser excimères, such as Krypton-Fluorine giving an ultraviolet radiation (248 Nm)

See too

Simple: Krypton

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