1. Do Now: 3/31/16 Use your Periodic Table to help you complete the first
HW: Finish Electron Shells worksheet, if necessary. Current Events #25-the end tomorrow. Quiz tomorrow!!!!
Do Now: /31/16
Use your Periodic Table to
help you complete the first
section of the
“Practice calculating
elements and atoms”
worksheet.

2. Challenge: Caffeine C8H10N4O23 3 3 24 3 3 2 6 6 2
Challenge: Caffeine C8H10N4O2

3. Topics on Tomorrow’s Quiz
Organization of Periodic Table
Atoms: PNE
Metals, Nonmetals and Metalloids
Counting atoms and elements
Extra help is available during your lunch period today.

4. New Topic: Electron Shells Chemistry has rules, too!
NOT ON QUIZ TOMORROW
What are the rules runners need to follow when using a track like this?
Chemistry has rules, too!

5. Notes: Electron Shell Rules
Each shell has a maximum number of electrons it can support.
The first three shells hold maximum of:
shell 1: 2 electrons
shell 2: 8 electrons
shell 3: 8 electrons
The last shell is called a “valence” shell. It may not be filled to its capacity. If it is filled,
it is “stable”.

8. Calcium 20 40
-20 20 20 .

9. 10 20
-10 10
2e-
8e- 10 10

10. 12 -6 6 6
2e-
4e- 6 6 24
-12 12 12
2e-
8e- 12
2e- 12

11. 27
-13 14 13 14
2e-
8e-
3e- 13
Argon 40
-18 22 18 22
2e-
8e-
8e- 18

13. . . . . .