PERIODIC ELEMENT
Fe (Iron)




Atomic number : 26
Atomic mass : 55.85 g.mol-1
Electronegativity according to Pauling : 1.8
Density : 7.8 g.cm-3 at 20 °C
Melting point : 1536 °C
Boiling point : 2861 °C
Vanderwaals radius : 0.126 nm
Ionic radius : 0.076 (+2) nm ; 0.064 (+3) nm
Isotopes : 8
Electronic shell : [Ar] 3d6 4s2
Energy of first ionisation : 761 kJ.mol-1
Energy of second ionisation : 1556.5 kJ.mol-1
Energy of third ionisation : 2951 kJ.mol-1
Standard Potential : - 0.44 V (Fe2+ / Fe) ; 0.77 V (Fe3+ / Fe2+)
Discovered by : The ancients
 
Atomic Structure Uses (Steel, hemoglobin (carries oxygen in blood))