Lithium is the lightest metallic element known. It was discovered in 1817 by a Swedish chemist, J. A. Arfvedson. It is a silver-white metal that tarnishes easily.
   Lithium is found for the most part in North America and Africa and is mined with pegmatite (granite) ores.
In industry, it is used in manufacturing glass and ceramic products and in lubricants. It can easily be worked, extruded or drawn and so may be used for delicate parts.
   The atomic number of lithium (symbol Li) is 3; its atomic weight is 6.941; its boiling point is 1342 °C. and melting point is 181 °C.

Lithium floating in oil