Element #3 is Lithium, which is a chemical element with the symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Lithium is the lightest of all metals and is highly reactive, so it is stored in mineral oil. It is the 33rd most abundant element in the Earth's crust and is found in many minerals, including spodumene, lepidolite, and petalite. Lithium is used in batteries, lubricants, glass, ceramics, and pharmaceuticals.