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1. What are the three subatomic particles?

2. Describe the similarities and differences between the following atoms.

⁵⁷X                   ⁵⁹X²⁺

3. Given the following information calculate the average atomic mass.

4. Give the number of each subatomic particle in the following substances.

A.  ⁷⁷Se                        B. ⁸¹Br^1-

5. What is an alpha particle?
6. Write the decay equation for alpha particle decay of ²³⁵U.
7. What is a beta particle?

8. Describe the difference between Alpha decay and beta decay.