Krypton

Symbol | Kr
Latin name | Krypton
Atomic number | 36
Period | 4
Element category | Noble gases
Relative atomic mass | 83.8
Group | VIII.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