1. The problem statement, all variables and given/known data We have two atomic systems, Na+ + Cl- (System A) and Na + Cl (System B), where all the particles are separated in the infinite distance. Which system (A or B) is higher in energy? Describe the energy difference of the two systems by ionization energy and the electron affinity 2. Relevant equations Probably none. 3. The attempt at a solution I really am not sure... What I know is that System A has charged particles and System B has neutral particles so due to System A's charged state, there would be more attraction between the particles.... Maybe System A has more energy because it is more likely to form Ionic Bonds???