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Unformatted text preview: .. Cr [Ar]4s 1 3d 5 Cu [Ar]4s 1 3d 10 Mo [Kr]5s 1 4d 5 Ag [Kr]5s 1 4d 10 W [Xe]6s 1 4f 14 5d 5 Au [Xe]6s 1 4f 14 5d 10 You are responsible for knowing these 6 exceptions to Hunds Rule. Pauli Exclusion Principle: two electrons cannot be in the same quantum state. Spin: within an orbital, one electron will be spin up the other will be spin down. Filling Orbital Boxes Always fill orbital boxes from LEFT to RIGHT Start with SPIN UP electrons first Always pair electrons spin up and spin down Practice: Write the electron configuration using the QM model. Draw the orbital diagram for the valence electrons. 1. S 2. Mg 3. F 4. Fe Conclusions: Aufbau Principle fill the lowest energy levels first Hunds Rule do not pair up electrons until you absolutely have to Pauli Exclusion Principle within an orbital, one electron is spin up, the other spin down...
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