Symbol Kr Atomic radius: pm - Fusion: kJ/Mole 1.64
Name Krypton Ionic radius: pm - Boiling point: C -153
Atomic number 36 Electron affinity Unstable anion Melting point: C -157tp
Atomic weight 83.80 1st  ion potential 14.00 Specific Heat Cap: J/(g K) 0.25
Classification Noble gas Natural form Gas Thermal Cond: W/(cm K) <0.001
Configuration [Ar]3d104s2p6 Crystal structure FCC Electrical Cond -
Oxidation states - Density 3.73 Abundance: mg/kg-crust <0.001
Electronegativity - Vaporization: kJ/Mole 9.08    
Krypton was discovered in 1898 by the English chemists Sir William Ramsay and Morris W. Travers. Uses - lamps, UV lasers