Lithium is an element that is part of the alkali metal group. It has an atomic number of 3 and an atomic mass of 6.94. It is represented by the symbol Li.
Lithium is a lustrous metal that is soft enough to be cut by a knife and that tarnishes when exposed to the air. It is commonly used in medicine, as well as in the manufacturing of lithium hydride batteries. Lithium has a melting point of 356.90 degrees Fahrenheit and a boiling point of 2,426 degrees Fahrenheit. At standard temperature and pressure conditions, lithium has a density of about 0.53 grams per cubic centimeter. It has an electron configuration of [He] 2s1.