1. Do Now
What similar feature can be seen in Mendeleev’s and Moseley’s periodic table?
What are the three subatomic particles and their corresponding properties?
Do you think similar properties of the elements are related to subatomic particles? If yes, which one? If no, why not?

2. The Hog Hilton
Complete Part 1

3. Hog Hilton Sample Problem
Book 15 hogs into their rooms
6th floor ____ ____ ____ ____ ___
5th floor ______ ______ ______
4th floor ______
3rd floor ______ ______ ______
2nd floor ______
1st floor ______

4. The Quantum Mechanical Model & Electron Configuration

5. The Quantum Mechanical Model
Tell us about the location and energy of electrons
Electrons do not have a direct orbit around the nucleus
Locations of electrons are based on probability
Electron clouds

6. Rules of Electron Configuration

7. Aufbau Principle Electrons enter orbitals of lowest energy first
Orbitals within a sublevel have equal energy
Which hog rule is this?

8. Pauli Exclusion Principle
An atomic orbital may only hold two electrons
Electrons must have opposite spin
Clockwise or counterclockwise
Denoted with arrows
Which hog rule is this?

9. Hund’s Rule
Every orbital of the same energy is singly occupied before any orbital is doubly occupied
Electrons have the same spin
Second electrons are added so the two electrons have opposite spins
Which hog rule is this?

10. The Hog Hilton
Complete Part 2

11. Electron Orbital Diagram
4s ___
3p ___ ___ ___
3s ___
2p ___ ___ ___
2s ___
1s ___

12. Analyze the Hilton What do the numbers in the Hog Hilton represent?
The floor number
What do the numbers in the electron orbital diagram represent?
The energy level the electron is in

13. Analyze the Hilton
Are the layouts of the Hog Hilton and the electron orbital diagram the same?
Number of rooms = Number of energy sublevels

14. How many electrons? How many electrons fit in the s energy level?
In the p energy level?
In the d energy level?

15. Filling Electron Orbitals
3d ___ ___ ___ ___ ___
4s ___
3p ___ ___ ___
3s ___
2p ___ ___ ___
2s ___
1s ___

16. Do Now Complete an atomic orbital diagram for calcium.
Complete an atomic orbital diagram for zinc.
Complete an atomic orbital diagram for krypton.

17. Write the electron configuration for the following:Li Be B C N O

18. My Hand Hurts! Write the electron configuration for Barium. Freeze!
Noble gas/short hand configuration:
Find the nearest noble gas that came before the element you are interested in
Write the symbol of that noble gas in [brackets]
Write the configuration as normal from there on

19. Lewis Dot Structures

20. Valence Electrons Electrons in the last energy level of an atom
Increase in number across a period
Equal to the group number of the element
Max # of valence electrons = 8

21. Valence Electrons Why are these the important electrons?
Are in the highest energy level
Most exposed
Most involved in chemical reactions

22. Lewis Dot Diagrams Show # of valence electrons an element has
Element’s symbol surrounded by dots
Dots = valence electrons
Drawn as if there is a square around the symbol
Two dots per side

23. Examples
Li Be B C
N O F Ne

24. Do Now
Draw the Lewis dot diagram for francium, phosphorus, and helium.
What do the dots mean?
What is the max number of valence electron an atom can have?

25. Properties Elements in same group have similar properties
Same number of valence electrons
Same number of electrons used in reactions
Examples
Noble gases - 8 valence electrons
Favorable - do not react
Halogens - 7 valence electrons
One electron short of max of 8 electrons
Readily react with elements who have a single electron