1. Example for Na [Ne] 3s1 Na = 1s2 2s2 2p6 3s1 electron configuration
neon's electron configuration (1s22s22p6)
third energy level
[Ne] 3s1
one electron in the s orbital
orbital shape
Na = 1s2 2s2 2p6 3s1
electron configuration

2. PRACTICE EXAMPLE Write the longhand and shorthand configurations for:
Antimony

3. X O Notation 2s 2p Electron Dot Diagrams show valence e- as dots
distribute dots like arrows in an orbital diagram
4 sides = 1 s-orbital, 3 p-orbitals
EX: oxygen X 2s 2p O

4. H He Li C N Al Ar F Fe La Energy Level Diagram Bohr Model
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
H He Li C N Al Ar F Fe La
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5. Hydrogen H = 1s1 H He Li C N Al Ar F Fe La Energy Level Diagram
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
H = 1s1
H He Li C N Al Ar F Fe La
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6. Helium He = 1s2 H He Li C N Al Ar F Fe La Energy Level Diagram
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
He = 1s2
H He Li C N Al Ar F Fe La
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7. Lithium Li = 1s22s1 H He Li C N Al Ar F Fe La Energy Level Diagram
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
Li = 1s22s1
H He Li C N Al Ar F Fe La
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8. Carbon C = 1s22s22p2 H He Li C N Al Ar F Fe La Energy Level Diagram
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
C = 1s22s22p2
H He Li C N Al Ar F Fe La
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9. Nitrogen N = 1s22s22p3 H He Li C N Al Ar F Fe La Energy Level Diagram
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
Hund’s Rule “maximum
number of unpaired orbitals”.
2s p 1s
Electron Configuration
NUCLEUS
N = 1s22s22p3
H He Li C N Al Ar F Fe La
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10. Fluorine F = 1s22s22p5 H He Li C N Al Ar F Fe La Energy Level Diagram
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
F = 1s22s22p5
H He Li C N Al Ar F Fe La
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11. Aluminum Al = 1s22s22p63s23p1 H He Li C N Al Ar F Fe La
Energy Level Diagram
Aluminum
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
Al = 1s22s22p63s23p1
H He Li C N Al Ar F Fe La
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12. Argon Ar = 1s22s22p63s23p6 H He Li C N Al Ar F Fe La
Energy Level Diagram
Argon
6s p d f
Bohr Model
5s p d
4s p d
Arbitrary Energy Scale
3s p N
2s p 1s
Electron Configuration
NUCLEUS
Ar = 1s22s22p63s23p6
H He Li C N Al Ar F Fe La
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13. Iron H He Li C N Al Ar F Fe La Energy Level Diagram Bohr Model
6s p d f
Bohr Model
5s p d N
4s p d
Arbitrary Energy Scale
3s p
2s p 1s
Electron Configuration
NUCLEUS
Fe = 1s22s22p63s23p64s23d6
H He Li C N Al Ar F Fe La
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14. Lanthanum H He Li C N Al Ar F Fe La Energy Level Diagram Bohr Model
6s p d f
Bohr Model
5s p d N
4s p d
Arbitrary Energy Scale
3s p
2s p 1s
Electron Configuration
NUCLEUS
La = 1s22s22p63s23p64s23d10
4s23d104p65s24d105p66s25d1
H He Li C N Al Ar F Fe La
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15. PRACTICE
Electron Configuration WS #1

16. Periodic Patterns s p d (n-1) f (n-2) 1 2 3 4 5 6 7 6 7
© 1998 by Harcourt Brace & Company

17. Periodic Patterns Period # energy level (subtract for d & f) A Group #
total # of valence e-
Column within sublevel block
# of e- in sublevel

18. 1s1 Periodic Patterns 1st column of s-block 1st Period s-block
Example - Hydrogen
1s1
1st column of s-block
1st Period
s-block

19. Periodic Patterns p s d (n-1) f (n-2) Shorthand Configuration
Core e-: Go up one row and over to the Noble Gas.
Valence e-: On the next row, fill in the # of e- in each sublevel. s
d (n-1)
f (n-2) p

20. Periodic Patterns
Example - Germanium
[Ar]
4s2
3d10
4p2

21. Shorthand Configuration
Element symbol
Electron configuration Ca
[Ar] 4s2 V
[Ar] 4s2 3d3 F
[He] 2s2 2p5 Ag
[Kr] 5s2 4d9 I
[Kr] 5s2 4d10 5p5 Xe
[Kr] 5s2 4d10 5p6

22. Stability 1+ 2+ 3+ NA 3- 2- 1- Ion Formation
Atoms gain or lose electrons to become more stable.
Isoelectronic with the Noble Gases. 1+ 2+ 3+ NA 3- 2- 1-

23. O2- 10e- 1s2 2s2 2p6 Stability Ion Electron Configuration
Write the e- configuration for the closest Noble Gas
EX: Oxygen ion  O2-  Ne
O e s2 2s2 2p6

24. PRACTICE
Battleship Activity
Electron Configuration WS #2