Atom

Open the Phet build-an-atom simulator.

Intro:

What is an atom? ______________________________________________________________________
Who were some of the scientists involved in discovering the atom? ______________________________
What particles are atoms composed of? ____________________________________________________

Hypothesis:

Predict how the addition of subatomic particles will affect the structure and properties of an atom. (Example: I predict that adding more neutrons will affect . . . )
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Procedure:
In the atom building simulator, select the first choice, labeled “Atom”. Select “orbits” as the model. Then click the “+” next to Net Charge and Mass Number to open both of those windows.

To build an atom, click and drag protons, neutrons, and electrons and place them into the atom.  Experiment with the atom builder and build 4 different atoms. Record the data for your atoms in the table below and then answer the analysis questions.

You may need to do additional experimenting to answer the analysis questions so keep the simulation open until you have completed the assignment.
Data:
Atom    Element    Protons    Neutrons    Electrons    Net Charge    Mass Number
1
2
3
4

Analysis and Conclusion:

1.  What causes an atom to become negatively charged? ______________________________________ _____________________________________________________________________________________

2. What causes an atom to become positively charged? ______________________________________ _____________________________________________________________________________________

3. What particle determines the name of the element? ________________________________________
4. Which particles compose the nucleus? ___________________________________________________
5. How is the mass number determined? ___________________________________________________
6. What is the name of an element with 3 protons and 3 neutrons? ______________________________
7. What is the name of an element with 3 protons and 5 neutrons? ______________________________
8. What is the name of an element with 5 protons and 3 neutrons? ______________________________
9. What can be altered in an atom without changing its identity? ________________________________
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10. Reflection: Which particle do you think is most important in an atom? Why? ____________________
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11. Was your hypothesis correct? Why or why not? ___________________________________________
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