SymbolKr
Latin nameKrypton
Atomic number36
Period4
Element categoryNoble gases
Relative atomic mass83.8
GroupVIII.A
Oxidation numbers
2, 4
Electron configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6
Density [g/cm3]
0.0037493
State
Gas
Melting point [°C]
-157.10
Boiling point [°C]
-152.30
Critical point [°C]
-63.74
Critical pressure [MPa]
5.5
Atomic radius [pm]
88
Covalent radius [pm]
110
Thermal conductivity [W m-1K-1]
0.00949
Heat capacity [J K-1g-1]
0.248
Discovery
1898
1.st ionization energy [eV]
13.9996
2.nd ionization energy [eV]
24.359
3.rd ionization energy [eV]
36.95
Stable isotopes
6
Unstable isotopes
17