Iron is a metal substance, and it is one of the elements in chemistry with the symbol, Fe, and atomic number 26. It belongs to group 8 and period four on the periodic table. According to its location on the periodic table, it is referred to as the transition element. Iron and its alloys are the most widely used metals, and also the most prominent ferromagnetic element in human's daily use. The metal looks radiant and likes a silver-grey color, but its coating looks brownish in color when exposed to air, this occurs as a result of oxidation. Iron looks soft in its pure form, but when impurities like carbon are added to it, it gets strengthened.
Cast iron, on the other hand, is a term used commonly in referring to grey iron. The term cast iron is used generally to refer to a huge group of alloys of metals that are solidified with a eutectic. The color with which the structured surface of the alloy is made of determines the kind of alloy it is. For example, an alloy with a structured white surface is referred to as white cast iron.