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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.