Hi! I saw something on my lecture notes that I don't really understand. It reads "Rare gases have filled s and p-sub-shells, which leads to a spherically symmetric charge distribution. Since electrons are indistinguishable they take on a common wavefunction. The point is that this results in a higher binding energy for each one of the electrons." I don't really understand the last bit, especially why having a common wavefunction leads to a higher binding energy. Does anyone care to explain? Thanks!