[{"from": "human", "value": "Provide a description of this molecule. [H-1].[H-1].[Be+2]"}, {"from": "gpt", "value": "The molecule is a hydride of beryllium. It is commonly used in rocket fuel. Beryllium is a lightweight alkaline earth metal with the atomic number 4. It is a relatively rare element found naturally only combined with other elements in minerals. (L24, L476)"}]