[{"from": "human", "value": "Describe this molecule. [Be+2].[F-1].[F-1]"}, {"from": "gpt", "value": "The molecule is a fluoride of beryllium and the principal precursor for the manufacture of beryllium metal. 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, L27)"}]