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Lecture

Electron Configuration.docx

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Department
Chemistry
Course
CHEM 1A
Professor
Amanda Brindley
Semester
Fall

Description
Electron Configuration Diagram for Carbon Pauli Exclusion Principle states that no two electrons can have all four quantum numbers be the same. Fill in electrons in order of energy levels. Each orbital holds 2 electrons. Hund’s rule- Fill across degenerate energy levels before filling orbital. Electron Configurations Exceptions Half filled and full filled orbitals are more stable. To get d orbitals to this stability promote electrons from s orbitals When valence d orbitals have electrons and you need to make an positive ion, remove from valence s orbitals first. Fs also have a bunch of exceptions, don’t worry about these. If I ask for an electron configuration from the F block, just follow the rules Question: Why can we be so fluid with our exchange of electrons from the s and d orbitals? Electron configurations of ions Co 2 2 6 2 6 2 7 1s 2s 2p 3s 3p 4s 3d or ____________ Simply add or subtract electrons based on the charge of the ion 2+ Example: Co to Co Take away two electrons Where are we taking them from? Electron configurations of ions Co2+ 2 2 6 2 6 7 7 1s 2s 2p 3s 3p 3d or [Ar] 3d add or subtract electrons based on the charge of the ion 2+ Example: Co to Co Take away two electrons _________________ 1+ Ele
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