1. Electron Configurations and Orbital Notation Diagrams
Helps predict chemical and physical properties of an atom

2. Orbital – region of space within an atom in which there is a high probability (90% chance) of finding an electron
s orbital – 1 per level
p orbitals – set of 3 per level
d orbitals – set of 5 per level
Recall each orbital can hold up to 2 electrons.

3. Atomic Orbital Chart
– possible e- orbitals in atom

4. Atomic Orbital Chart Link to orbitals
High Energy Level = Bigger Orbital (on average e- are farther from nucleus, but still can only hold 2 e-)
Can hold max 2e-
Can hold max 2e-
Can hold max 2e-
Link to orbitals

5. Electron Configuration and Orbital Notation Diagrams
Hydrogen, Element #1
1s1
# of e- in sublevel
Energy level
Orbital type
ORBITAL NOTATION:
ELECTRON
ORBITAL

6. Orbital Notation: Represent orbitals as
OR OR
Represent electrons as or

7. General Rules Aufbau Principle Electron Config generator
Electrons fill the lowest energy orbitals first.
Each orbital can hold
TWO electrons with
opposite spins.

8. General Rules WRONG RIGHT Hund’s Rule
Within a sublevel containing more than orbital (p,d or f), place one e- per orbital before pairing them.
“Empty Bus Seat Rule”
WRONG
RIGHT

9. Capacities of Different Sublevels

10. s1 s2 p1 p2 p3 p4 p5 p6 S sublevel can hold up to 2 e-
p sublevel can hold up to 6 e- p1 p2 p3 p4 p5 p6

11. d sublevel can hold up to 10 e-

12. d3 d4 d5 d6

13. d7 d8 d9
d10

14. Electron orbitals being filled and location on the Periodic table
Why is the s block 2 elements wide?
Why is the p block 6 elements wide?
Why is the d block 10 elements wide? s p
d (n-1)

15. Looking for patterns – fill in column 2 and row 3

16. Looking for patterns – fill in column and row 3

17. Electron Configurations and Periodic Table
What do you notice that is different about the numbering for d sublevels? (Both the line # and the e- count #’s)

18. Electron Configurations and Periodic Table

19. Using the Periodic Table to Determine the electron configuration
Link to tutorial
What is the electron configuration of Boron, element #5?

20. Write the electron configuration and orbital notation diagram for Oxygen, Element #8
1s2
2s2
2p4
Link animation

21. Write the electron configuration and orbital notation diagram for Oxygen, Element #8
Link animation
1s s p4 1s 2s 2p

22. Orbital Notation: Represent orbitals as
OR OR
Represent electrons as or

23. HW 8-6, p.
1s s
H, #1 :
He, #2:
Li, #3:
Be, #4:

24. Practice: 1s
H, #1 : 1s1

25. Practice: 1s
H, #1 : 1s1
He, #2:
1s2

26. Practice:
1s s
H, #1 : 1s1
He, #2: 1s2
Li, #3:
1s2
2s1

27. Practice:
1s s
H, #1 : 1s1
He, #2: 1s2
Li, #3: 1s22s1
Be, #4: 1s22s2

28. Practice:
1s 2s p
B, #5 :
C, #6:
N, #7:
O, #8:

29. Practice:
1s 2s p
B, #5 :
1s2
2s2
2p1

30. Practice:
1s 2s p
C, #6 :
1s2
2s2
2p2

31. Practice:
1s 2s p
B, #5 : 1s22s22p1
C, #6: 1s22s22p2
N, #7: 1s22s22p3

32. Practice: 1s 2s 2p B, #5 : 1s22s22p1 C, #6: 1s22s22p2 N, #7: 1s22s22p3
O, #8: 1s22s22p4

33. HW 8-6
Al, #13 : 1s2 2s p s p1

34. HW 8-6
Si, #14 : 1s2 2s p s p2

35. HW 8-6
P, #15 : 1s2 2s p s p3

36. HW 8-6
S , #16 : 1s2 2s p s p4

37. HW 8-6
Cl, #17 : 1s2 2s p s p5

38. HW 8-6
Ar, #18 : 1s2 2s p s p6

39. Quantum Warmup #2: Write the electron configuration and orbital notation diagrams for the following elements
Mg, #12
1s2 2s2 2p6 3s2
1s2
2s2
2p6
3s2

40. Quantum Warmup #2: Write the electron configuration and orbital notation diagrams for the following elements
Ti, #22
1s2 2s2 2p6 3s2 3p6 4s2 3d2
1s2
2s2
2p6
3s2
3p6
4s2
3d2

41. B, #5: [He]2s22p1 Mg, #12: [Ne]3s2 K, #19: [Ar]4s1 Sr, #38: [Kr]5s2
Core notation: What is the pattern? Check the periodic table. What elements are present in the core notation? What is special about these elements?
B, #5: [He]2s22p1
Mg, #12: [Ne]3s2
K, #19: [Ar]4s1
Sr, #38: [Kr]5s2

42. The “Core Element” core abbreviations always comes from the nobel gas family – completely filled valence electron levels.

43. Core abbreviation notation
Core electrons – Inner level electrons; these levels are completely filled
Valence e-
nucleus
Core (inner e-)
Valence electrons – outer level electrons; these levels are in the process of being filled.
Importance of Valence Electron Configuration: Determines chemical behavior
Core abbreviation focuses attention of electrons important for chemical bonding

44. CORE ABBREVIATION Notation
Longhand Configuration
Na 11e-
1s2
2s2
2p6
3s1
Core Electrons
Valence Electrons
Core Abbreviation Notation
Na 11e- [Ne] 3s1 3s
Video link

45. Using Periodic table to write core abbreviation
Shorthand Configuration
Core e-: Go to the end of the row Noble Gas and go up to previous row Noble gas.
Valence e-: On the next row, fill in the # of e- in each sublevel.
Orbital Notation Diagrams for valence electrons only

46. What is the core for a period (row) 3 element such Al?

47. What is the core abbreviation notation for Al, #13
[Ne]
3s2
3p1

48. What is the core for a period (row) 4 element such as V, element #23?

49. What is the core for a period (row) 5 element such as Sn, element #50?

50. HW 8-7 Key Link