Week 8, Lithium

Lithium is atomic number 3 and is a soft, white alkali metal. It is considered to be the lightest metal and the least dense solid element under normal conditions. Lithium is thought to be one of the rare metals created in the big bang, but is not common throughout the universe and it's creation and apparent disappearance is still under investigation. Although the element seems to hold no biological use in humans, lithium salts have been used as mood stabilizers. The splitting of the lithium atom was the first human made nuclear reaction.