The number of neutrons in the nucleus of 92U235 is:
Correct answer: D. 143
- A. Infinite
- B. 92
- C. 235
- D. 143
Explanation
The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (A) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (A) and the atomic number (Z).N = A-Z = 235-92 = 143
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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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