PERIODIC ELEMENT
Zr (Zirconium)

 



Atomic number : 40
Atomic mass : 91.22 g.mol-1
Electronegativity according to Pauling : 1.2
Density : 6.49 g.cm-3 at 20 °C
Melting point : 1852 °C
Boiling point : 4400 °C
Vanderwaals radius : 0.160 nm
Ionic radius : 0.08 nm (+4)
Isotopes : 11
Electronic shell : [Kr] 4d25s2
Energy of first ionisation : 669 kJ.mol-1
Energy of second ionisation : 1346 kJ.mol-1
Energy of third ionisation : 2312 kJ.mol-1
Energy of fourth ionisation : 3256 kJ.mol-1
Discovered by : Martin Klaproth in 1789
 
Atomic Structure Uses (nuclear applications)