Atomic+Theory

Development of the Atomic Model Activity # 2

Part 1 A: 1. From the Wiki, click on the experimenting with models link, and then click on the run button. Once the simulation is loaded, click on the tab that says Plumb pudding. 2. Using the legend, what makes up an alpha particle? What element would this be? 3. Click on show traces (so you can see the pathway of the moving particles). 4. Draw a labeled diagram of the plumb pudding model below.

5. Push the gun trigger and record your observations.

B: 1. Now click on the Rutherford tab. Click on show traces. Watch the screen for a moment. a) What is present in the middle of the screen?

b) What atom does this most likely represent? Explain

2. Push the gun trigger and record your observations.

3. Is there any correlation between the size of the nucleus and the observed affects of the alpha particles? (hint: you can alter the size of the nucleus)

 Part 2 Collect and record some of the theory behind the plumb pudding model and the nuclear model.

Click on the Rutherford movie and answer the following questions: 1. Draw and label the Thompson model of the atom below.

2. Draw and label Rutherford’s experimental design or set up.

3. Complete the table below.
 * Rutherford’s Hypothesis for his experiment || Rutherford’s Observations (record at least 3) || Rutherford’s conclusions ||

4. Do you see any flaws with this model?

.