Homonym: li (Unit)
Li is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white metal that belongs to the alkali metal group. Lithium is highly reactive and flammable, and it is the lightest metal and the least dense solid element. It is commonly used in batteries, particularly in rechargeable lithium-ion batteries, which power many electronic devices.
In addition to its use in batteries, lithium has applications in mental health treatment, particularly for bipolar disorder. It helps stabilize mood swings and is often prescribed in the form of lithium carbonate. The element is also used in various industrial processes, including the production of glass and ceramics.