Lithium is the third element on the periodic table.
It has been used in the treatment of several mental disorders including bipolar disorder.
It has been used in the creation of thermo nucleuar weapons.
It has three electrons and only one of them is in its final or valence shell.
It is a solid at room temperature and it is the least dense solid at room temperature of all elements.
It is one of the most common elements on the planet earth.
Lithium is one of the most reactive substances in the universe. For this reason it is rarelly found on its own.
It is one of the least common light elements in the universe.