The full form of BF in chemistry typically refers to Boron Monofluoride.
Boron monofluoride (BF), also known as fluoroborylene, is a chemical compound consisting of one boron atom and one fluorine atom. It's an unstable diatomic gas under normal conditions. While not stable on its own, BF can act as a stable ligand when bonded to transition metals, similar to carbon monoxide (CO). This property makes it relevant in coordination chemistry.
Therefore, when you see "BF" in a chemical context, especially when discussing transition metal complexes or diatomic gases, it most likely means Boron Monofluoride.