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Directions: Use the following section of the periodic table to complete the following.

1. Use a pencil to lightly shade in the boxes of all the elements with only radioactive isotopes.

2. Compare the electric repulsion of the protons in the uranium nucleus (element 92) with the

repulsion of the protons in the nucleus of barium (element 56).Which repulsion is larger?

3. Consider your answer to #2 above and determine which nucleus experiences a stronger net

force holding its protons and neutrons together.

4. How does the relationship shown by #2 and #3 above help to explain the radioactivity of

uranium, but not barium.

5. What statement can you make about the relationship between atomic numbers and radioactivity?

Directions: The atomic number of uranium is 92. The most stable isotope of uranium is uranium-238. The

radioactive isotope of uranium is uranium-235. In the spaces provided, write the symbols for the nucleus of each

isotope of uranium.

|Uranium-238 |Uranium-235 |

6. How many neutrons does uranium-238 contain?

7. How may neutrons does uranium-235 contain?

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The Nucleus

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