Which of the following terms is used for the mass of chlorine 35.5 ?
Correct answer: A. relative atomic mass
- A. relative atomic mass
- B. mass number
- C. atomic weight
- D. relative isotopic mass
Explanation
The value 35.5 is the weighted average relative atomic mass of naturally occurring chlorine isotopes, mainly 35Cl and 37Cl. It is not a mass number, because mass number belongs to one isotope and must be a whole number such as 35 or 37. The likely mistake is choosing d by associating the value with isotopes, but relative isotopic masses are given for individual isotopes rather than the average chlorine value.
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