Iron is a lustrous, ductile, malleable, silver-gray metal (group VIII of the periodic table). It is known to exist in four distinct crystalline forms. Iron rusts in damp air, but not in dry air. It dissolves readily in dilute acids.
Standard potential: - o.44 V (Fe2+/ Fe); 0.77 V ...
Density: 7.8 g.cm-3 at 20°C
Melting point: 1536 °C
Ionic radius: 0.076 nm (+2); 0.064 nm (+3)
