1. What is an atom? What particles make up an atom?
2. True or false: Trillions of atoms would fit inside the period at the end of this sentence.
3. What are subatomic particles with a positive charge called?
4. You have a sample of the element fluorine to analyze. The sample is made up of neutral atoms.
Using the information in the diagram, determine the number of protons, neutrons, and
electrons found in each atom of your sample. Explain your answer.
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.
6. What is the atomic number of an atom? Why is this number important?
7. All carbon atoms have six protons. Most also have six neutrons, but some have seven or eight
neutrons. What is the mass number of a carbon isotope that has seven neutrons?