1. 12/4/17- 12/5/17
BELLRINGER: QUANTUM MECHANICS REVIEW WORKSHEET
YOUR NEXT QUIZ ON QUANTUM THEORY/ ELECTRON CONFIGURATION IS ON:
12/11 (A) OR 12/12 (B-DAY)
TUTORING IS OFFERED AFTER EVERY B-DAY!
HOMEWORK: ELECTRON CONFIGURATION WORKSHEET

2. Electron Configuration
Ms. Donis
Chemistry 1

3. Quantum Numbers (P.A.M.S)
Principle Quantum Numbers (n): number of shells
Angular Quantum Number (l): type of orbital (s, p, d or f)
S orbitals can hold up to 2 electrons
P orbitals can hold up to 6 electrons
D orbitals can hold up to 10 electrons
F orbitals can hold up to 14 electrons
Magnetic Quantum Number (ml): orientation of the orbitals
Spin (ms): spin of the electrons

4. Electron Configuration
Electron Configuration: refers to arrangement of the electrons around the nucleus, and that tells us about its reactivity
Example: Sodium reacts with water to produce explosions/fire

5. How do we write Electron Configurations?
The number of shells that an atom has corresponds to the the periods in the periodic table.
Example: Sodium (Na) is in period 3, so it will have 3 energy shells (n=3)

6. How do we write Electron Configuration?
The periodic table is separated by sections that contain specific types of orbitals.
Electron Configuration is cumulative

7. How do we write Electron Configuration?
Examples: Hydrogen (1) contains a 1s orbital
Sodium(11) contains: 1s, 2s, 2p, 3s orbitals
Rubidium (37) contains: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s orbitals

8. Electron Configuration Notation
Determine the number of electrons your atom has Ex: Potassium has 19 electrons
Determine the number/type of orbitals your atom will have Ex: Potassium will have: 1s, 2s, 2p, 3s, 3p, 4s orbitals

9. Electron Configuration Notation
3. Start filling up the orbitals with the corresponding electrons. (i.e. s= 2, p=6, d=10, f=14)
1s- will hold 2 electrons
2s- will hold 2 electrons
2p- will hold 6 electrons
3s- will hold 2 electrons
3p - will hold 6 electrons
4s- will hold ONLY 1 electron

10. Electron Configuration Notation
Because Potassium only has 19 electrons, that last 4s orbital will be half full.
4. Write the correct electron configuration
1s2 2s2 2p6 3s2 3p6 4s1
*Superscripts correspond to the electrons

11. Electron Configuration Notation
Electron Configuration Sublevel Diagram: an alternative to the periodic table.
This is a great diagram to know for your next quiz/exam

12. Electron Configuration Notation
Examples: Write Electron Configuration for the following atoms:
Copper (Cu)
Nickel (Ni)
Cesium (Cs)

14. D

15. D

16. Noble Gas Notation
This is another method of representing electron configurations of noble gases.
Noble gases are elements in the last column of the periodic table. They are really stable and have electrons in their outermost orbital.

18. Noble Gas Notation Correct Noble Gas Notation is:
[Noble gas preceding the atom] valence electrons

19. Noble Gas Notation Example: Potassium 1s22s22p63s23p64s1 [Ar] 4s1
Argon has one valence electron on the 4th shell

20. Noble Gas Notation Example: Silicon 1s22s22p63s23p2 [Ne] 3s23p2
Silicon has 4 valence electrons on the 4th shell