Why is it much harder to explain the line spectra of polyelectronic atoms and ions than it

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Why is it much harder to explain the line spectra of polyelectronic atoms and ions than it is to explain the line spectra of hydrogen and hydrogenlike ions?

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Chemistry An Atoms First Approach

ISBN: 9781305079243

2nd Edition

Authors: Steven S. Zumdahl, Susan A. Zumdahl

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