1. Noble Gas Notation

2. Noble Gas (or Shorthand) Configurations
Example: Na (11 e-)
1s22s22p63s1
Core electrons
(do not participate in the “chemistry of the element)

3. Noble Gas (or Shorthand) Configurations
Example: Na (11 e-)
1s22s22p63s1
Valence electron
Core electrons
(do not participate in the “chemistry of the element)

4. Noble Gas (or Shorthand) Configurations
Example: Na (11 e-)
1s22s22p63s1
Shorthand: Use previous Noble Gas to represent core electrons

5. Noble Gas (or Shorthand) Configurations
Example: Na (11 e-)
1s22s22p63s1
Shorthand: Use previous Noble Gas to represent core electrons
[Ne] 3s1

6. Steps for Writing Noble Gas Electron Configuration
Determine the Noble Gas that is one row up from the element.
Put the symbol for the Noble Gas in brackets.
Continue writing the electron configuration using the periodic table from the Noble Gas.

7. Noble Gas (or Shorthand) Configurations
Another Example: P (15 e-)

8. Brain Break: Textbook Twist
Line up in 2 lines facing the opposite direction of the person next to you.
Twist to pass the textbook down the line
Whichever line gets the textbook down and back the fastest wins!

9. Noble Gas (or Shorthand) Configurations
Another Example: Ca (20 e-)

10. Noble Gas (or Shorthand) Configurations
You Try: Br (35 e-)

11. To Review Electron Configurations
A Way to Track the Electrons in an Atom

12. To Review Electron Configurations
A Way to Track the Electrons in an Atom
Remember:
1s22s22p63s23p64s23d7

13. Consider This Configuration…
1s22s22p63s23p64s23d104p4

14. Consider This Configuration…
1s22s22p63s23p64s23d104p4
Can we determine which element this configuration describes?

15. Consider This Configuration…
1s22s22p63s23p64s23d104p4
Look at very end of configuration

17. Identify these elements
1s22s22p4
1s22s22p63s23p1
1s22s22p63s23p64s23d2

18. Time to Practice