Iron
Elemental State Fe
Electron Configuration 1s22s22p63s23p64s23d6
First Ionization Potential 7.902 eV
Electron Affinity 0.151 eV
Z* 5.434 (Clementi-Raimondi)
Pauling Electronegativity 1.83
Covalent Radius 1.20 Å
Metallic Radius 1.26 Å
Ionic Radius 0.77 Å Fe2+ coordination number = 4; high spin

0.78 Å Fe2+ coordination number = 4, square planar; high spin

0.75 Å Fe2+ coordination number = 6; low spin

0.920 Å Fe2+ coordination number = 6; high spin

1.06 Å Fe2+ coordination number = 8; high spin

0.63 Å Fe3+ coordination number = 4; high spin

0.69 Å Fe3+ coordination number = 6; low spin

0.725 Å Fe4+ coordination number = 6

0.39 Å Fe6+ coordination number = 4

van der Waal's Radius  
Melting Point 1538 oC
Boiling Point 2861 oC
Density 7.874 g/cm3
Other Properties