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They are different concepts I believe. Shielding occurs when the inner electrons block the outer electrons from the nuclear positive charge, which makes the outer electrons easier to remove. I would use this as a justification for ionization energy, but not atomic radius. Electron electron repulsions push the electrons farther apart which can be a justification for atomic radius trends and ionization energy because it puts more distance between the electrons as well as making it easier to remove them . Hope that made sense
They are related in a sense. Shielding is when electrons in a lower energy level "shield" electrons in an outer energy level causing them to be less attracted or "pulled" by the nucleus. The example Dr. Lavelle gave in class was your friend blocking you from the heat of a fire by standing front of you. Electron repulsion is the result of electrons being unattracted and repelling each other, which is a part of shielding, and also relates to why atomic radius increases down a group due to increased electrons.
shielding occurs across energy levels because the electrons in the energy levels that are closer to the nucleus block the electrons higher up from receiving the full charge. electron-electron repulsion occurs within the same energy level because when there are multiple electrons, they push each other away to create more space/stability.
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