While lithium, an alkali metal, is used as a mood stabilizer for bipolar disorder, it is not a compound but rather the pure element itself.
It's important to distinguish between elements and compounds.
* Elements are the simplest forms of matter that cannot be broken down further by chemical means (e.g., lithium).
* Compounds are formed when two or more different elements are chemically bonded together (e.g., lithium carbonate, which is used to treat bipolar disorder).
So, while lithium is an alkali metal and is used to treat bipolar disorder, it is not an alkali metal compound.
