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Zone of Stability (Grades 11-12)

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Zone of Stability

1. 
Out of 2000 nuclides, approximately how many are considered stable?
  1. 350
  2. 120
  3. 279
  4. 1000
 
2. 
When a nuclide is considered unstable, what generally occurs as a result?
  1. The nuclide undergoes spontaneous decay
  2. The nuclide undergoes nonspontaneous decay
  3. The nuclide undergoes combustion
  4. The nuclide undergoes decomposition
3. 
Which of the following number of protons or neutrons will lead to stability?
  1. 3
  2. 9
  3. 28
  4. 127
 
4. 
Which of the following numbers, based on the number of protons or neutrons, will lead to stability?
  1. 8
  2. 21
  3. 27
  4. 51
5. 
Which of the following would be considered stable?
  1. N-14
  2. S-32
  3. He-4
  4. H-2
 
6. 
Which of the following nuclides would be considered unstable?
  1. Si-29
  2. O-16
  3. He-4
  4. Ca-40
7. 
Which of the following atomic numbers is the threshold for stability?
  1. 26
  2. 53
  3. 77
  4. 83
 
8. 
Which of the following particles will be the heaviest, when emitted from an unstable nuclide?
  1. Beta
  2. Positron
  3. Neutron
  4. Alpha
9. 
Note the ratio of protons to neutrons that will lead to the greatest stability for lighter nuclides.



 
10. 
Note the ratio of neutrons to protons that will lead to stability in heavier nuclides?



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