[{"from": "human", "value": "Provide a brief overview of this molecule. [Na+1].[AlH4-1]"}, {"from": "gpt", "value": "The molecule is a hydride of sodium and aluminum. It is a reducing agent and is used for hydrogen storage in hydrogen tanks. Aluminum is the most abundant metal in the earth's crust and is always found combined with other elements such as oxygen, silicon, and fluorine.  (L739, L740, L778)"}]