PERIODIC ELEMENT
Ir (Iridium)





Atomic number : 77
Atomic mass : 192.2 g.mol-1
Electronegativity according to Pauling : 2.2
Density : 22.4 g.cm-3 at 20 °C
Melting point : 2450 °C
Boiling point : 4527 °C
Vanderwaals radius : 0.126 nm
Ionic radius : 0.066 nm (+4)
Isotopes : 11
Electronic shell : [Xe] 4f14 5d7 6s2
Energy of first ionisation : 886 kJ.mol-1
Standard Potential : + 1.0 V (Ir2+ / Ir)
Discovered by : Smithson Tennant in 1804
 
Atomic Structure Uses (tip gold pens, crucible and special containers)