Krypton is a noble gas with a mass of 83.80 u that melts at 115.79 K and boils at 119.93 K. It was discovered in 1898 and, like other noble gases, is used in lighting and photography due to its high light output in plasmas. Krypton plays an important role in many high-powered gas lasers and there is also a specific krypton fluoride laser.
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Krypton
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Kriptón –
Krypton
Mass: 83,80 u
1s2 2s2 2p63s23p64s23d104p6
Melting point: 115,79 K
Boiling point: 119,93 K
Density: 3,749 g/cm3
Discovery: 1898
Krypton, like the other noble gases, can be used in lighting and
photography. Krypton light has a large number of spectral lines, and
krypton's high light output in plasmas allows it to play an important role
in many high-powered gas lasers (krypton ion and excimer lasers), which
pick out one of the many spectral lines to amplify. There is also a
specific krypton fluoride laser. The high power and relative ease of
operation of krypton discharge tubes caused (from 1960 to 1983) the
official length of a meter to be defined in terms of the 605 nm (red-
orange) spectral line of krypton-86.