1. Warm-up
Determine the amounts of protons, neutron and electrons for the following elements:
Lithium
Calcium
Silicon
Argon

2. How to draw Bohrs Models

3. 1. First, find the number of protons, neutrons and electrons 2
1. First, find the number of protons, neutrons and electrons 2. Draw a nucleus 3. Look at the period. This is the number of shells the atom will have. Ex. Elements in Period 2 have two shells

4. Continued
4. Look at the Group Number, this will tell you the number of electrons in the last (outer) shell 5. There is a maximum amount of electrons that can exist on each level.

5. Rules for Bohrs Models
6. Shell # 1 (next to the nucleus) can only have up to two electrons
7. Shell # 2 can only have up to 8 electrons
8. Shell # 3 can only have up to 8 electrons
9. Shell # 4 can only have up to 18 electrons
Shell #5 can only have up to 18 electrons
IMPORTANT: You must fill a shell before you can move to the next shell

6. Bohrs Models of Li and Na