The costs of silicon will vary depending on the purity of the silicon. For 100g of 99% pure silicon you would pay about $36. For the same amount at 99.9999% purity you would pay about $273. The value of aluminum scrap metal varies with the stock market. At some point it may be worth 50 cents while at other times it may be closer to a dollar. The valued rate of aluminum scrap on December 12, 2011 was .9369 or approximately 94 cents per pound. Right now copper is worth $3.3375-$3.3511 per pound.
Silicon is one of the most useful elements to mankind. Sand and clay, which both contain silicon, are used to make concrete and cement. Sand is also the principal ingredient of glass, which has thousands of uses. Silicon is a component of steel, and silicon carbides are important abrasives and also used in lasers. Silicon is present in pottery and enamels, and in high-temperature materials. However, silicon is increasingly used in micro-electronic devices. The silicon is usually doped with precise, very small amounts of boron, gallium, phosphorus or arsenic for use in transistors, solar cells, rectifiers and other instruments.
Although silicon is way more expensive than the other elements we were considering, we know that if we were to make a cell phone case out of it our buyers would get the best quality. We chose silicon because while researching the all of the elements we found that silicon can suppress itself in most destructive conditions cell phone and cell phone cases face.