CK-12 Physical Science Concepts - For Middle School

http://www.ck12.org Chapter 2. Matter

Review

1. Describe the nucleus of the atom.


2. Why is the nucleus positive in charge?


3. Explain why the nucleus is very dense.


4. Outline the forces that act on particles in the nucleus.


5. If you made a three-dimensional model of an atom and its nucleus, how would you represent the atom? How
   would you represent nucleus? Explain your choices.