1. Electron Configuration from the Periodic Table

2. Periodic Table helps you determine the filling order.

3. Using The Periodic Table to Write Electron Configuration
Start at Hydrogen. This is 1s1. Then go to Helium, this is 1s2.
Each box counts as the next electron in that sublevel.
Once you reach the end of the sublevel, write this down on your paper.
Continue to follow the periodic table, writing down the configuration as you go.
Stop when you get to the element you are writing the electron configuration for.

4. Write the Electron ConfigurationsSi Ar Ca

5. Brain Break: Interval Countdown
10 Air Squats
9 Bicep book/backpack curls
8 imaginary jump rope
7 overhead book/backpack extensions
6 star jumping jacks
5 alternating forward lunges (both legs=1 rep)
4 deep breaths
3 toe touches
2 shoulder rolls
1 deep sigh

6. Finding Valence Electrons from the Electron Configuration
The valence electrons are the electrons in the outermost energy level.
Find the highest energy level (The numbers)
Count the electrons in all sublevels (the letters) of this energy level.
Example:
1s22s22p63s23p64s23d104p2
2 + 2 = 4 valence electrons

7. Example How many valence electrons do the following elements have?
1s22s22p63s23p64s23d9
1s22s22p2
1s22s22p63s23p64s23d104p4
1s22s22p63s23p64s23d104p65s24d4

8. Example: How many core electrons do the following elements have?
1s22s22p63s23p1
1s22s22p63s23p64s23d1
1s22s22p4
1s22s22p63s23p5

9. Example
What type of orbital are the valence electrons in for the following elements: Na Cu O Ce