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Electron Arrangement in Atoms. Electron configurations Aufbau principle Pauli exclusion principle...

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 ELECTRON CONFIGURATIONS: Series of sublevel notations which describes what sublevels electrons currently reside in  Tells you where the electrons are  3 Rules to electron configuration Aufbau’s Principle Pauli Exclusion Principle Hund’s Rule
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Chemistry Electron Arrangement in Atoms
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Page 1: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

ChemistryElectron

Arrangement in Atoms

Page 2: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Section 2 Terms Electron configurations Aufbau principle Pauli exclusion principle Hund’s rule

Page 3: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Go (con)Figure ELECTRON CONFIGURATIONS: Series

of sublevel notations which describes what sublevels electrons currently reside in

Tells you where the electrons are 3 Rules to electron configuration

• Aufbau’s Principle• Pauli Exclusion Principle• Hund’s Rule

Page 4: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Aufbau’s Principle Electrons

occupy orbitals of lowest energy first

Each box represents an orbital

Aufbau Diagram

Page 5: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Range of an energy level can overlap those of another

Think crossing your fingers

Page 6: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

The Pauli Exclusion Principle

No more than two electrons in an orbital and they must have opposite spin• Spin can be thought of as

clockwise and counterclockwise

• Vertical arrows up or down indicate direction of spin

Page 7: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Hund’s Rule Must be one e- in

each orbital of equal energy before pairing

Remaining spot filled with e- of opposite spin

Page 8: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.
Page 9: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Writing Electron Configs

To write electron configs for an element:• Determine # of electrons the element has

The atomic number tells you how many e- if the element is neutral, which we will assume is the case

• Fill sublevels of lowest energy first Use Aufbau diagram (left side) to figure out who is

lowest Put electrons in orbital until filled

• For every electron in a sublevel, indicate with the sublevel name and a superscript Example: He = 2 e-, written as 1s2

C = 6 e-, written as 1s2 2s2 2p2

Page 10: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

To figure out which sublevels filled first:• 1s• 2s 2p• 3s 3p 3d• 4s 4p 4d 4f• 5s 5p 5d 5f• 6s 6p 6d 6f

Page 11: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Section 2 Assignment Write the electron configurations for the

following elements B Cl P Ar Ca Ti Fe Hg Er

Page 12: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Aufbau Diagram

Page 13: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Aufbau Diagrams

Page 14: Electron Arrangement in Atoms.  Electron configurations  Aufbau principle  Pauli exclusion principle  Hund’s rule.

Aufbau Diagrams


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