Mass number A refers to ..............
Correct answer: B. Number of nucleons
- A. Number of electrons
- B. Number of nucleons
- C. Number of neutrons
- D. Number of protons
Explanation
The sum of atomic number (Z) and number of neutrons is called atomic mass(A). Protons and neutrons are collectively called nucleons.
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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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