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As a general rule metals and nonmetals form ionic bonds,

Na (sodium) is a metal, F (fluorine) is a nonmetal.

But to be sure you must look at the Electronegativity values for each element;

Na - 0.9

F - 4

There is a large difference between these indicate that it is ionic. If there were closer together like the bonds in CH4

Electronegativities;

C - 2.5

H - 2.2

They will form covalent bonds

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