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Chemistry
Explaining Differences in Terbium & Uranium Electron Configs
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[QUOTE="DrDu, post: 6413353, member: 210532"] I would not consider f0, f7 and f14 as exceptions. Binding energy increases and size of f orbitals decreases continuously with increasing nuclear charge. So evidently f0 and f14 are extremal. After f7, orbitals have to be occupied with two electrons, which costs more energy. Also, while relativistic effects certainly are of high importance in actinides, I don't think they have huge impact on d and f electrons, as these don't get very near the nucleus (outer shells + high angular momentum). [/QUOTE]
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Explaining Differences in Terbium & Uranium Electron Configs
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