To calculate the formal charge of the nitrogen N 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 forms 3 single bonds with 3 hydrogen atoms, which means there are 6 bonding electrons 2 electrons per bond . There are no non-bonding electrons on nitrogen in ammonia.Now, we can plug these values into the formula:Formal charge = 5 - 0 - 1/2 * 6 Formal charge = 5 - 0 - 3Formal charge = 2So, the formal charge of the nitrogen N atom in ammonia NH3 is 0.