To calculate the formal charge on the nitrogen atom in the NO3- molecule, we can use the following formula:Formal charge = Valence electrons of the atom - Non-bonding electrons - 0.5 * Bonding electrons In the NO3- molecule, nitrogen is the central atom, and it is bonded to three oxygen atoms. Nitrogen has 5 valence electrons, and each oxygen atom has 6 valence electrons. The molecule has a single negative charge, which means there is an extra electron in the molecule.Since nitrogen is bonded to three oxygen atoms, there are three single bonds, which means there are 2 * 3 = 6 bonding electrons. Nitrogen does not have any non-bonding electrons lone pairs in this molecule.Now, we can calculate the formal charge on the nitrogen atom:Formal charge = 5 - 0 - 0.5 * 6 Formal charge = 5 - 0 - 3Formal charge = 2So, the formal charge on the nitrogen atom in the NO3- molecule is +1.