1. Electron Configurations

2. Bell Work
Why do we need to study atoms and subatomic particles such as electrons.

3. SPI’s & CLE’s: SPI 3221.1.2 Describe an elements atomic make-up
SPI Describe an atoms composition and electron composition.
CLE Investigate the characteristic properties of matter.

4. Objective:
TLW evaluate electrons by writing electron configurations and orbital diagrams
TLW review electrons and light
TLW evaluate and understand atoms, electrons, and electron configurations
TLW determine the importance of electron configurations to the world in which we live
TLW link electrons and electron configuration to matter, composition, and reactions.

5. What are electron Configurations?
A written arrangement of electrons in an atom.
Shorthand notation of where the electrons are in an atom.
Electrons in an atom tend to have arrangements that have the lowest possible energies.

6. What are Quantum numbers?
A number that specifies the region in which electrons can be found.
The number can be a 1, 2, 3,or 4.
Each quantum number can have orbitals
There are s- oribitals, p-orbitals, d-orbitals, and f-orbitals(rememeber orbitals are where electrons are located)

7. What is the Aufbau Principle?
States that electrons fill orbitals that have the lowest energy first.

8. What is the Pauli Exclusion Principle?
States that two, but no more than two, electrons can occupy a singe orbital.

9. What is Hund’s Rule?
States that the orbitals of the same quantum numbers are each occupied by one electron before any pairing occurs (Electrons are represented by arrows).

10. Electron Review Why are Electron Configurations important?
Shows us were electrons are located.
Identifies Valence Electrons
What is meant by the Duality of light/electrons?
Behave like particles
Behave like waves

11. What are valence electrons?
Electrons in the outermost shell
Electrons that participate in chemical reactions
Why is this important?

12. ELECTRON CONFIGURATION
1s > 2s > 2p > 3s > 3p > 4s >3d

13. Orbitals (Energy of Orbitals)

14. Orbital Diagram _ _ _ _ _ _ _ _ _ Guided Practice:
Electron Configuration
1s 2s 2p 3s 3p
Orbital Diagram
_ _ _ _ _ _ _ _ _
1s s p s p

15. Independent Practice:
Symbol
Name
- e
Electron
Configuration
1s > 2s > 2p > 3s > 3p > 4s >3d Na O Cl

16. Electron Review Why are Electron Configurations important?
Shows us were electrons are located.
Identifies Valence Electrons
What is meant by the Duality of light/electrons?
Behave like particles
Behave like waves

17. Enrichment:
Which of the following “rules” is being violated in each electron configuration below? Explain your answer for each. Hund’s Rule, Pauli Exclusion Principle, Aufbau Principle
   __ __
1s s p
Hund’s Rule

18. Ticket Out The Door
Write the Electron Configuration and Orbital Diagram for Calcium.