In the nucleus of uranium, the number of neutrons will be _____________?
Correct answer: D. Different for different isotopes
- A. 92
- B. 235
- C. 143
- D. Different for different isotopes
Explanation
The number of neutrons is the mass number minus the atomic number, and uranium isotopes have different mass numbers while all uranium atoms have 92 protons. For example, uranium-235 has 235 - 92 = 143 neutrons, whereas uranium-238 has 238 - 92 = 146 neutrons. Students may choose c by treating uranium-235 as the only uranium isotope.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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