jroballo Lithium is a rare silvery-white chemical element with the symbol Li. It is an alkali metal with many industrial uses and is the least dense solid element. Lithium is a highly combustible solid that reacts violently with water. The metal, powder, or dust may also spontaneously ignite in the air. Lithium is a naturally occurring element in rock ores or briny water, where extraction uses evaporation. Processors crush the ores into lithium, which is an essential ingredient in clean energy and other tec ...