Things to think about:
1. What exactly *is* charge? How do we think of it? How does this relate to protons and electrons, etc.?
2. Explain the demonstrations from class, particularly the rotating meter stick.
3. Why is it that electrons are the easiest particles to manipulate?
4. What does atomic number mean?
5. What is the most common element, and why?
6. What are quarks?
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