Using oxidation numbers explain why the formulas NaF2 is incorrect?

In the compound NaF2, sodium typically has an oxidation state of +1, and fluorine has an oxidation state of -1. When combined in a compound, the total oxidation numbers must add up to zero, but in NaF2 they add up to +2 (-1 for each fluorine and +1 for sodium), which is incorrect. The correct formula should be NaF.