To calculate the formal charge of nitrogen in the NO3- molecule, we will use the formula:Formal Charge = Valence Electrons - Non-bonding Electrons - 1/2 x Bonding Electrons For nitrogen N in NO3-, we have:1. Valence Electrons: Nitrogen belongs to Group 15 or Group 5A in the periodic table, so it has 5 valence electrons.2. Non-bonding Electrons: In the NO3- molecule, nitrogen is bonded to three oxygen atoms, and there are no lone pairs on the nitrogen atom. Therefore, there are 0 non-bonding electrons.3. Bonding Electrons: Each nitrogen-oxygen bond in NO3- is a double bond, which means there are 2 x 3 = 6 bonding electrons.Now, we can plug these values into the formula:Formal Charge of N = 5 - 0 - 1/2 x 6 Formal Charge of N = 5 - 0 - 3Formal Charge of N = +2So, the formal charge of nitrogen in the NO3- molecule is +2.