2. Bohr Model The nucleus contains protons & neutrons
Electrons orbit in the space around the nucleus.
“Planets around the sun”

3. Bohr Model
This restricts electrons to certain orbits and cannot effectively model all the elements [

4. Electron Cloud Model
Electrons move somewhat randomly in the space around the nucleus. [

5. Electron Cloud Model
“Clouds” are shaded to show where electrons are more likely to be found

6. Electron Cloud Model
Bohr Model

7. Sub-Atomic Particles Protons Given by the atomic number of an element.
+ 1 Charge
Actual mass = 1.67x10-24 g
Atomic mass = 1 amu [

8. Sub-Atomic Particles Neutrons
Atomic mass minus Atomic number equals the # of neutrons
No charge
Actual mass = 1.67x10-24 g
Atomic mass = 1 amu [

9. Sub-Atomic Particles Electrons
Same number as the protons when neutral!
-1 charge
Actual mass = 9.11x10-28 g
Atomic Mass = 0 amu

10. Table on Pg. 104 [