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Test Your Understanding of Table N

Test Your Understanding of Table N

1. What is the half-life of neon-19?

2. What is the decay mode of plutonium-239?

3. Which radioisotope decays the fastest?

4. Which radioisotope decays the slowest?

5. How many decay modes are included in the table?

6. Write the nuclear reaction of each radioisotope.

   Example: 198             0           198

                       Au  -->    e     +        Hg

                    79            -1             80

7. List all the radioisotopes that undergo beta decay and compare their atomic mass with the relative atomic mass of the respective element. What do you notice and can you find an explanation for the trend?

8. List all the radioisotopes that undergo positron decay and compare their atomic mass with the relative atomic mass of the respective element. What do you notice and can you find an explanation for the trend?

9. Alpha decay occurs mainly in isotopes with atomic numbers larger than 60. List all the radioisotopes undergoing alpha decay and verify the statement.  

10. According to the big bang theory the universe started 1.5 x 10¹⁰ years ago. How many half-lives uranium-238 has undergo since the big bang?