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- TL;DR Summary
- We can consider atomic nucleus fixed, so we suppose it doesn't move. But for what elements is Born–Oppenheimer approximation the least accurate (the nucleus moves a "a lot")?
I would say that for the elements with the lowest atomic numbers, because these elements have their nuclei the lightest and so they can move more and their movement influence electrons more than in some heavier elements, whose nuclei move less. Am I right or not?