1. Atomic Models
Bohr Model
Cloud Model

2. Bohr Model Electrons orbit the nucleus in definite orbits.
The orbits can hold only a specific number of electrons.
Once a level is full, the electrons start filling the next level.

3. Electron Level Limits:
1st Level = 2 electrons
2nd Level = 8 electrons
3rd Level = 8 electrons

4. Hydrogen: + -

5. Helium:

6. Lithium:

7. Beryllium

8. Cloud Model:
The electrons are in an area around the nucleus called an electron cloud.
There are enough electrons to make the atom’s charge neutral

9. Hydrogen: 1P 0N 1E

10. Helium: 2P 2N 2E

11. Lithium 3P 3N 3E

12. Assignment:
Draw a Bohr Model and a Cloud Model for the first 18 Atoms on the Periodic Chart.
Include the Atomic Number and Mass.
You may write rather than draw the number of protons and neutrons there are in the nucleus, but draw all electrons for the bohr model.