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Elements are classified into three different categories: metals, nonmetal, and metalloids.  Some examples of metal elements are iron (Fe), zinc (Zn), copper (Cu), and tin (Su).  Nonmetals are (as you could probably guess) an element that is not a metal.  This includes carbon (C) and oxygen (O).  Finally, metalloids have both metallic and nonmetallic properties.  Examples of metalloids are silicon (Si) and germanium (Ge).  Metals are commonly ductile, conductive, and malleable, meaning that it flattens without shattering when struck.  Nonmetals are nonconductive and are brittle, meaning that they can shatter into pieces.  These qualities decide where certain elements will be used.