Which of the following statements regarding a nucleon is true in regards to nuclear reactions?
A. The number of nucleons changes in a nuclear reaction, therefore the mass changes.
B. A nucleon inside a nucleus has a lower mass than a nucleon outside of the nucleus.
C. A nucleon is more stable outside the nucleus.
D. A nucleon has a higher energy inside a nucleus and releases it when it undergoes nuclear reactions.
E. A nucleon's mass is constant.
Answer: B
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