Commentary on Allen & Kinght’s Response to the Löwdin Challenge
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This commentary provides a critical examination of a recent article by Allen and Knight in which the authors claim to provide the long-sought explanation for the Madelung, or n + ℓ, n rule for the order of orbital filling in many-electron atoms. It is concluded that the explanation is inadequate for several reasons.
KeywordsScandium Periodic Table Nodal Structure Block Element Perturbation Operator
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I thank the reviewers for their comments and suggestions on this paper.
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