1. The problem statement, all variables and given/known data Question: Drawn an orbital overlap diagram to represent the bonding in ammonia, NH3. 2. Relevant equations none 3. The attempt at a solution I learned that bonding occurs with the outermost s and p orbitals. For nitrogen: 1s2 , 2s2 , 2p3 For Hydrogren: 1s1 X 3. This is what I drew Someone told me to think about the Pauli Exclusion Principle and that my diagram is incorrect because of some of the spin states in the orbitals. The Pauli Exclusion Principle states that each orbital can old 2 electrons. If two electrons are in the same orbital they must have opposite spins. In my diagram, any orbital that has two electrons has opposite spins, so I am not sure what the person was telling me. Thanks!