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Aufbau - Aufbau Principle A Electrons go into the orbital...

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Colby College Aufbau Principle A. Electrons go into the orbital of lowest energy that is available. B. Pauli Exclusion Principle: no two electrons can have the same set of quantum numbers. C. Hund's Rule: For a degenerate set of orbitals, the energy is minimized when the electrons occupy different orbitals and have the same spin quantum number. To guess the lowest energy orbital we make the following observations: I. Each successive shell is shielded to a greater extent by previous shells. This shows that Z eff does not increase as quickly as Z. Inner orbitals decrease in energy faster than outer orbitals. II. Orbitals with low l penetrate more and then are less easily shielded by outer electrons. This shows that Z eff is greater for low l orbitals than high l orbitals with the same principle quantum number. III. Electrons in the same subshell don't shield each other well. This shows that Z eff for electrons with the same l increases with Z.
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