1. Bohr Models
A drawing of an atom that shows the protons and neutrons in the nucleus and the electrons in the correct orbitals.

2. Proton Review Mass = 1 AMU Number of Protons = Atomic Number
Charge = +1
Location = In the nucleus

3. Neutron Review Mass = 1AMU
Number of Neutrons = Atomic Mass – Atomic number
Charge = 0
Location = In the nucleus

4. Electron Review Mass = 1/2000 AMU Number of Electrons = Atomic Number
Charge = -1
Location = in a cloud outside of the nucleus

5. Electron Orbitals
Electrons are found within certain areas around the nucleus
Each of these areas is called an orbital.

6. Electron Orbital - 1 The 1st orbital is closest to the nucleus.
1st fills 1st.
Only holds 2 electrons

7. Draw a hydrogen atom

8. Electron Orbital – 2
The 2nd orbital fills after the 1st orbital is filled
Holds 8 electrons

9. Draw a lithium atom

10. Electron Orbital – 3
The 3rd orbital fills after the 2nd orbital is filled
Holds 8 electrons

11. Draw a sodium atom