Identify the hybridization of the n atom in nf3.

sp3 hybridization

Explanation:

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Based on the Lewis structure Nitrogen has 3 valence electrons with a lone pair of non-bonded electrons, thus, the hybridization calculation rule,

Allows us to identify that the has three attached atoms and one lone pair. Now, by considering the convention: sp3=4, sp2=3  and sp=2 , one finds that:

Therefore, has sp3 hybridization.

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c. electrical charges of ionic bonds.