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

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Presentation transcript:

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

How to draw Bohrs Models

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

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.

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

Bohrs Models of Li and Na