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