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Which of the following best describes a radioactive isotope?A. Its nuclear forces are balanced.B. Its nucleus is unstable.C. It has no mass defect.D. Its electrons are not quantized.

Answer :

Radioactive elements are those that have the ability to emit rays or particles from their nucleus, a radioactive isotope can emit different types of alpha, beta or gamma rays. This is because its nucleus is unstable.

Therefore, the answer will be:

B. Its nucleus is unstable.

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