Ciro Santilli
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Aufbau principle
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🗖 nosplit
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↑ parent "Hartree-Fock method"
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🗖 nosplit
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⇓ toc
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↑ parent "Hartree-Fock method"
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Wikipedia
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Orbitals energies for large atoms don't increase in energy like those of hydrogen due to electron interactions.
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Notably, 4s fills before 3d as we increase the atomic numbers.
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Bibliography:
https://chemistry.stackexchange.com/questions/8357/why-does-the-3rd-electron-shell-start-filling-up-with-scandium
https://www.quora.com/If-4s-orbitals-are-higher-in-energy-than-3d-orbitals-then-why-do-electrons-fill-up-in-4s-before-filling-up-in-3d
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Incoming links
Why do multiple electrons occupy the same orbital if electrons repel each other?