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Electron Configuration of Platinum
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[QUOTE="TeethWhitener, post: 5851258, member: 511972"] This is a pretty good resource on advanced concepts regarding electron configurations in atoms: [URL]http://pubs.acs.org/doi/full/10.1021/ed8001286?src=recsys[/URL] In case it's paywalled, the main point is that electron-electron interactions matter. In the case of platinum specifically, there is quite a lot going on. First, the 6s and 5d orbitals are very close in energy in the platinum system. In addition, there is a (generic) difference between electron repulsion in the d orbitals and in the s orbitals. S orbitals tend to be more diffuse and d orbitals tend to be more compact. Therefore, electron repulsion tends to drive d-orbital filling to higher energies than s-orbital filling. There are also spin-orbit interactions to consider (spin-orbit terms are zero in the s-orbital case but nonzero in the d-orbital case). These all combine and balance out in a certain way to give you the experimentally observed electron configuration. In the case of platinum, this means roughly that the repulsion felt by adding the final electron to the d-subshell is larger than the energy gained by completing that subshell, so the electron ends up in the s-orbital. [/QUOTE]
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Electron Configuration of Platinum
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