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Orbital Filling Pauli Exclusion Principle Pauli Exclusion Principle No more than two electrons can be in the same orbital No more than two electrons can be in the same orbital Aufbau Principle Aufbau Principle Electrons fill orbitals that have the lowest energy first Electrons fill orbitals that have the lowest energy first Hund’s Rule Hund’s Rule Orbitals of the same quantum number are occupied by one electron before any pairing occurs Orbitals of the same quantum number are occupied by one electron before any pairing occurs
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Warm UpWarm Up 9-17-159-17-151. Which element has this electron configuration
1s22s22p4
2. How many electrons are in the s orbitals for Mg? 3. How many electrons can the d orbital hold?4. Write the electron configuration for Zr
HomeworkSept 18 - Online HWSept 23 - Test Unit 2Sept 23 - Notebook check
AgendaTurn in flame labNotes Unit 2-6Test review WSOnline HW
Unit 2-6Unit 2-6Short Hand Electron Short Hand Electron
ConfigurationConfiguration
Orbital FillingOrbital Filling Pauli Exclusion PrinciplePauli Exclusion Principle
No more than two No more than two electrons can be in the electrons can be in the same orbitalsame orbital
Aufbau PrincipleAufbau Principle Electrons fill orbitals that Electrons fill orbitals that
have the lowest energy have the lowest energy firstfirst
Hund’s RuleHund’s Rule Orbitals of the same Orbitals of the same
quantum number are quantum number are occupied by one electron occupied by one electron before any pairing occursbefore any pairing occurs
Orbital Filling ExamplesOrbital Filling Examples
E. Configuration (Short Hand)E. Configuration (Short Hand)
Using the previous noble gas as a baseUsing the previous noble gas as a base
Sulfur Sulfur = = Ne as a base Ne as a base = =
Short handShort hand ==
1s2 2s2 2p6 3s2 3p4
1s2 2s2 2p6
[Ne] 3s2 3p4
E. Configuration E. Configuration Short Hand NotationShort Hand Notation
Electron ConfigurationElectron ConfigurationExceptions:Exceptions:Cu = [Ar] 3dCu = [Ar] 3d1010 4s 4s11
Cr = [Ar] 3dCr = [Ar] 3d55 4s 4s11
Check for understanding:Check for understanding:Write the short hand notation for O, Mg, ZnWrite the short hand notation for O, Mg, Zn
AssignmentsAssignmentsWS Unit 2 test review due next classWS Unit 2 test review due next classOnline HW due Friday Online HW due Friday
https://quest.cns.utexas.edu/Notebook check Unit 2 due next weekNotebook check Unit 2 due next week
6 days of notes6 days of notesUnit 2-1 till 2-6Unit 2-1 till 2-630 points total30 points total