Pilgaard Solutions

Krypton


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Other names/abbreviations: Kr



Element no: 36
Element group: 18 (IUPAC)
VIII A (American labelling)
VIII B (European labelling)
Noble gasses
Element type: Nonmetals
CAS-Number: 7439-90-9
EINECS-Number: 231-098-5



Chemical properties

Reaction of krypton with halogens
Krypton will react with fluorine, F2, when cooled to -196°C (liquid nitrogen) and zapped with an electric discharge or X-rays, forming krypton(II) fluoride, KrF2.

Kr (s) + F2 (s) KrF2 (s)

This compound decomposes when heating to room temperature.

The other halogens do not react with krypton.


Reaction of hydrogen with the water
Krypton does not react with water, but is slightly soluble; approximately 59.4 cm3/kg at 20°C (293 K) [1]


Physical properties

Appearance

Physical state @ 20°C: Gas [1]
Color: Gas: Colourless
Solid: White
Luminescence: Color of the fluorescent light: yellow - greenish light


Bulk properties

Molecular weight (g/mol): 83.80(1) [1]
Melting point (°C): -157.20 [1]
Boiling point (°C): -153.35 [1]
Density (g/cm3): 0.0037493 [1]
Molar volume (cm3): 27.99
Velocity of sound (m/s): 1120


Optical properties

Refractive index: 1.000427


Thermodynamic properties

ΔfH°gas (KJ/mol): 0.0 [2]
ΔH°fusion (KJ/mol): 1.37 [2]
ΔH°vaporization (KJ/mol): 9.05 [1]


S°gas (J/mol·K): 164.1 [2]


Cp (gas) (J/K·mol): 20.786 (25 °C) [2]


Critical temperature (°C): -63.74 [2]


Crystal structure

Crystal type: Face centered cubic


Electronic properties

Electron configuration: 1s2-2s2-2p6-3s2-3p6-3d10-4s2-4p6


Conductivity

Thermal (W/m·K): 0.00874 [1]


References

1: Greenwood,N.N., Earnshaw,A. Chemistry of the elements
2nd edition (1997) Edited by Greenwood,N.N., Earnshaw,A. pp. 1-1340, Butterworth-Heinemann. Oxford. Great Britain

2: CRC Handbook of Chemistry and Physics
75th edition (1994) Edited by Lide,D.R. , CRC Press Inc. Boca Raton, USA

3: General chemistry
7th edition (1984) Edited by Holtzclaw, Jr.,H.F., Robinson,W.R. & Nebergall,W.H. pp. 1-932. D.C. Heath and Company. Lexington







© Michael Pilgaard
Created: March 6, 2008