PERIODIC ELEMENT
H (Hydrogen)

 



Atomic number : 1
Atomic mass : .007825 g.mol-1
Electronegativity according to Pauling : 2.1
Density : 0.0899*10-3 g.cm-3 at 20 °C
Melting point : - 259.2 °C
Boiling point : - 252.8 °C
Vanderwaals radius : 0.12 nm
Ionic radius : 0.208 (-1) nm
Isotopes : 3 ( Protium 1H1, Deuterium 1H2 and Tritium 1H3 )
Electronic shell : 1s1
Energy of first ionisation : 1311 kJ.mol-1
Discovered by : Henry Cavendish in 1766
 
Atomic Structure Uses (Balloons, metal refining)