Sodium fluoride (NaF) is an ionic compound, not a molecular compound. In sodium fluoride, sodium (Na) loses an electron to become a positively charged sodium ion (Na+), while fluorine (F) gains an electron to become a negatively charged fluoride ion (F-). These oppositely charged ions are then attracted to each other, forming an ionic bond and resulting in the compound sodium fluoride.

In contrast, molecular compounds are formed by the covalent bonding of atoms, where atoms share electrons rather than transferring them completely.