PERIODIC ELEMENT
Kr (Krypton)

 



Atomic number : 36
Atomic mass : 83.80 g.mol-1
Density : 3.73 10-3 g.cm-3 at 20 °C
Melting point : - 157 °C
Boiling point : - 153 °C
Vanderwaals radius : 0.197 nm
Isotopes : 15
Electronic shell : [Ar] 3d10 4s2 4p6
Energy of first ionisation : 1351 kJ.mol-1
Energy of second ionisation : 2350.4 kJ.mol-1
Energy of third ionisation : 3565 kJ.mol-1
Discovered by : Sir Ramsay in 1898
 
Atomic Structure Uses (Lighting)