Here's why:

* Electronegativity: Fluorine is the most electronegative element, meaning it has a strong attraction for electrons. Carbon is also electronegative, but less so than fluorine.

* Sharing Electrons: Due to this electronegativity difference, carbon and fluorine share electrons to form a stable bond. Both atoms achieve a full outer shell of electrons by sharing.

While the bond is covalent, it's important to note that the shared electrons are not shared equally. The electrons are pulled more strongly towards the fluorine atom, making the bond polar covalent. This means the carbon-fluorine bond has a partial negative charge on the fluorine side and a partial positive charge on the carbon side.