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Topic 12: Nuclear Chemistry

16. Half-Life: Determining and interpreting half-life information Using Reference Table N
1. What is the half life of potassium – 42?
1) 1.23 s 2) 12.4 h 3) 14.3 d 4) 27.5 s

2. Which of the following radioisotope has the longest half-life?
1) Fr-220 2) K -37 3) Fe-53 4) K-42

3. Which radioisotope has the shortest half-life? 37 32
14
3
1) C 2) H 3) K 4) P

4. Which radioisotope has a half-life that is less than 1 minute?
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1) K – 37 2) K – 42 3) Ca – 37 4) Ne - 19

4. Compared to K-37, the isotope of K-42 has a
1) Shorter half-life and the same decay mode
2) Longer half-life and the same decay mode
3) Shorter half-life and a different decay mode

4) Longer half-life and a different decay mode

5. Compared to Uranium – 238, uranium – 235 has a
1) Shorter half-life and the same decay mode
2) Shorter half-life and a different decay mode
3) longer half-life and the same decay mode
4) longer half-life and a different decay mode

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