Nanografi Nanotechnology

General Information about Iron                                          Iron  is a chemical element with symbol Fe and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron exists in a wide range of oxidation states, -2 to +7, but +2 and +3 states are the most common. Iron metal has been used since ancient times, although copper alloys, which have lower melting temperatures, were used even earlier in human history. Pure iron is relatively soft, but is unobtainable by smelting because it is significantly hardened and strengthened by impurities. Iron chemical compounds have many uses.  Iron oxide  mixed with aluminium powder can be ignited to create a thermite reaction, used in welding and purifyi...