Discovered By: Sir William Ramsay, Morris William Travers
Discovery year: 1898

The following table showing some properties of Krypton(Kr):

Table Example
Atomic number 36
Group 18
Period 4
Block p
Electrons 36
Protons 36
Neutrons 48
Atomic weight 83.798
Oxidation states 0, +2, +4
Electrons per shell K2 L8 M18 N8


Table Example
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6
Gas atomic multiplicities 1
Atomic radius 88 pm
Covalent radius 116 pm
Van der Waals radius 202 pm
Boiling point -153.22°C
Melting point -157.36°C
Phase Gas
Fusion heat 1.64 kJ.mol^-1
Vaporization heat 9.02 kJ.mol^-1


Table Example
Color Colorless
Density 3.75 kg.m^-3
Molar volume 2.23*10^-2 m^3.mol^-1
Refractive index 1.000427
Sound speed 1120 m.s^-1
Thermal conductivity 0.00943 W.m^-1.K^-1
Magnetic type Diamagnetic
volume magnetic susceptibility -1.65*10^-8
Mass magnetic susceptibility -4.4*10^-9 m^3.kg^-1
Molar magnetic susceptibility -3.69*10^-10 m^3.mol^-1


Table Example
Electronegativity 3
Valence 2
Electron affinity 0 kJ.mol^-1
First ionization energy 1350.8 kJ.mol^-1
Radioactive No
Neutron cross section 25 barn
Specific heat 248.05 J.kg^-1.K^-1