Krypton - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Kr

Relative atomic mass: 83.798 +- 0.002

English: Krypton
French: Krypton
Croatian: Kripton
German: Krypton
Italian: Cripto
Spanish: Kripton

Atomic number: 36
Group numbers: 18
Period: 4
Standard state (20 ^oC): gas

Discovery: 1898 Sir William Ramsay, Morris William Travers (GB)

Krypton was discovered by Sir William Ramsay and Morris William Travers (GB) in 1898. The origin of the name comes from the Greek word kryptos meaning hidden. It is a colourless, odourless rare noble gas that reacts only with fluorine. Krypton is obtained from production of liquid air. Krypton is used in lighting products. It is used as inert filler-gas in incandescent bulbs and some is mixed with argon in fluorescent lamps. The most important use is in flashing stroboscopic lamps that outline airport runways. The price of 99.995 % pure krypton gas costs 165.30 €/dm3 in small quantities (1 dm3) and about 4.51 €/dm3 in large quantities (300 dm3).

Electronic configuration: [Ar] 3d¹⁰ 4s² 4p⁶
Formal oxidation number: 0
Atomic radius: 202 pm

Electronegativities: -
Thermal conductivity: 0.0095 W/(m K)
Electrical resistivity (20 ^oC): - microOhm cm

Melting point: -157.36 ^oC
Boiling point: -153.22 ^oC

Heat of fusion: 1.64 kJ/mol
Heat of vaporization: 9.05 kJ/mol
Heat of atomization: 0 kJ/mol