Chemistry

Elements of the periodic table

Elements of the periodic table


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Kr (krypton)

Tab. 1
krypton
Name of the element:krypton
Latin name:krypton
English name:krypton
French name:krypton
Symbol:Kr
Atomic number:36
Condition at 25 ° C:gaseous, non-metal
Frequency (in ppm):0.00001
Discovered by:Ramsay and Travers (1898)
Electron configuration:[Ar]3d104s24p6
Oxidation states:+2, +4
Relative atomic mass:83.80
Electronegativity:not known
Atomic radius (in pm):198
Ionization energy (in eVatom-1):13.999
Density (in kgm-3):3.7493
Melting temperature (in K):116.6
Boiling temperature (in K):120.85
Tab. 2
Isotopes of Krypton
Mass numberAtomic massFrequency /%Nuclear spin
7877.92040.350
8079.91642.250
8281.913511.600
8382.914111.50+92
8483.911557.000
85*84.91150+92
8685.910617.300

* Isotope is not stable and decays


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