Silicon, 14Si

Silicon is a chemical element with symbol Si and atomic number 14. A hard and britlle crystalline solid with a blue-grey metallic lustre, it is a tetravalant metalloid and semiconductor. It is a member of group 14 in the periodic table, along with carbon above it and germanium, tin, and lead below.

``A metalloid is any chemical element wich has properties in between those of metals and nonmetals, or that has mixture of them. There is neither a standard definition of a metalloid nor complete agreement on the elements appropriately classified as such. Despite the lack of specificity, the term remains in use in the literature of chemistry. ``