To calculate the formal charge of the nitrogen atom in ammonia NH3 , we can use the following formula:Formal charge = Valence electrons of the atom - Non-bonding electrons - 1/2 Bonding electrons For nitrogen N , the number of valence electrons is 5 as it belongs to Group 15 in the periodic table .In ammonia, nitrogen is bonded to three hydrogen atoms, and each N-H bond has 2 bonding electrons. So, there are a total of 3 2 = 6 bonding electrons.Nitrogen has one lone pair non-bonding electrons in ammonia, which consists of 2 electrons.Now, we can calculate the formal charge:Formal charge of N = 5 - 2 - 1/2 6 Formal charge of N = 5 - 2 - 3Formal charge of N = 0So, the formal charge of the nitrogen atom in the ammonia molecule NH3 is 0.