Here's why:

* Electronegativity: Fluorine is the most electronegative element, while nitrogen has a significantly lower electronegativity. This means fluorine has a stronger attraction for electrons.

* Sharing of Electrons: Instead of one atom completely taking electrons from the other (ionic bonding), nitrogen and fluorine share electrons to achieve a stable configuration.

* Polar Covalent: While the bonds are covalent, the large difference in electronegativity makes the bonds polar. This means there's a partial negative charge on the fluorine atoms and a partial positive charge on the nitrogen atom.

Let me know if you'd like to know more about covalent bonds or electronegativity!