Exam-style question
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Explain how the presence of too many neutrons can lead to the instability of a nucleus.
Model answer
What a good answer should say
- The presence of too many neutrons in a nucleus can lead to instability because neutrons do not exert an electromagnetic repulsive force like protons do.
- However, they do contribute to the overall mass and can disrupt the balance needed for the strong nuclear force to effectively bind the nucleus.
- This imbalance can result in the nucleus undergoing beta decay to reduce the neutron-to-proton ratio, ultimately leading to a more stable configuration.
Explanation
Why this works
This answer effectively explains the cause (excess neutrons), the mechanism (disruption of balance affecting the strong nuclear force), and the effect (beta decay) with its consequence (achieving stability). It demonstrates a clear understanding of nuclear stability concepts.
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