The atomic mass of an element is fractional, because ______________________?
Correct answer: C. It may have isotopes
- A. Of uncertainty principle
- B. It may have isobars
- C. It may have isotopes
- D. It contains neutrons
Explanation
Natural elements usually contain several isotopes with different masses, so their reported atomic mass is a weighted average and may be fractional. Neutrons contribute to mass but do not themselves explain why the average is fractional.
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