PERIODIC ELEMENT
I (Iodine)

 



Atomic number : 53
Atomic mass : 126.9045 g.mol-1
Electronegativity according to Pauling : 2.5
Density : 4.93 g.cm3 at 20 °C
Melting point : 114°C
Boiling point : 184 °C
Vanderwaals radius : 0.177 nm
Ionic radius : 0.216 nm (-1) ; 0.05 nm (+7)
Isotopes : 15
Electronic shell : [Kr] 4d105s2 5p5
Energy of first ionisation : 1008.7 kJ.mol-1
Standard potential : + 0.58 V (I2 / I-)
Discovered by : Bernard Courtois in 1811
 
Atomic Structure Uses (required in humans)