1. Aim: Models of the Atom

2. Questions to answer during play?
What was Dalton’s model of the atom?
What did Dalton’s atomic theory propose?
Which particle did JJ Thomson discover?
What was Thomson’s model of the atom?
How were Thomson’s and Daltons’ model different?
What were Rutherford’s conclusions from the Gold Foil Experiment?
Where are electrons located in the Bohr model?
Where are electrons located in the Wave Mechanical Model?

3. 1. What was Dalton’s model of the atom?
atom was like a tiny solid ball that could not be broken up into parts

4. 2. What did Dalton’s atomic theory propose?
All elements are composed of atoms.
Atoms of the same element have the same properties but differ in properties from the atoms of other elements.
Every chemical change consists of the combination or separation of whole atoms.
Atoms do not subdivide during a chemical change.

5. 3. Which particle did JJ Thomson discover?
The electron
Negatively charged particle

6. 4. What was Thomson’s model of the atom?
The atom is neutral
Plum Pudding Model: atoms mostly consist of positively charged material with negatively charged particles (electrons) located throughout.

7. 5. How were Thomson’s and Daltons’ model different?
Dalton’s model was 1 sphere that cannot be divided, Thomson had the plum pudding where electrons are randomly spread throughout a positively charged sphere.

8. 6. What were Rutherford’s conclusions from the Gold Foil Experiment?
Atom has a positively charged nucleus
electrons are outside
atoms are mostly empty
Nucleus contains most of the mass.

9. 7. Where are electrons located in the Bohr model?
Protons and neutrons are in the nucleus
Electrons can only be certain distances from the nucleus
The electrons orbit the nucleus at fixed energy levels (shells)
The electrons must absorb or emit a fixed amount of energy to travel between these energy levels

10. 8. Where are electrons located in the Wave Mechanical Model?
The electron does not move in a definite path.
An electron is in an orbital which is the most probable location where the electron is.