The average cost of silicon is $0.50 per gram. Silicon (Si) is the most common metalloid. A chemical element with atomic number 14, silicon is a tetravalent metal and is less reactive than its chemical analog carbon. It rarely occurs as the pure free element in nature. It is widely distributed as silica and silicates. Silicon is the second most abundant element in Earth’s crust, after oxygen. It has many industrial uses. It is the principal component of integrated circuits or microchips. Silicon is one of the few substances like water, bismuth and gallium, whose density is higher in liquid than in solid state.