A radioactive element will decay when its atomic number is:
Correct answer: C. Greater than 82
- A. Equal to 82
- B. Less than 82
- C. Greater than 82
- D. Does not depend upon number
Explanation
A radioactive element will decay when its atomic number is greater than 82. This is because elements with an atomic number greater than 82 have too many protons in their nucleus, and the repulsive force between the protons becomes too strong. As a result, the nucleus is unstable and will decay, releasing energy in the process.
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Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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