1. Notes #3: Electron Configuration
GET OUT YOUR “GOOD” PERIODIC TABLE!!!
Notes #3: Electron Configuration
WCHS Chemistry

2. Have you labeled your “good” Periodic Table?

3. Electron Configuration
= shorthand notation to show how many e- are in each orbital
Ex: He = 1s2
See a PATTERN!
There are exceptions, but we don’t worry about them
There are s, p, and d blocks
The period tells you the energy level

5. s p d 3d 4d f

6. Always default to the longhand version!
You may use these only if told to.
Always default to the longhand version!
ONLY USED SOMETIMES. WILL TEST FULL LENGTH!
SHORTHAND
Noble Gas Configuration - Write last full energy level [Noble gas] and then continue on after that
Examples:
F =
Sr =
[He]2s22p5
[Kr]5s2

7. Always default to the longhand version!
You may use these only if told to.
Always default to the longhand version!
EVEN SHORTER HAND!
Just write the last number
Examples:
Ca =
Ni =
Br =
4s2
3d8
4p5

8. cont... You can also identify an element by its shorthand notation!
Examples:
2p3 =
5p5 =
4d2 = N I Zr