atomic weight = average atomic mass of the element and fractional abundance of the isotope
The atomic weight of Cl is 35.5 amu. However, the mass spectrum of Cl (Figure 2.12 in the textbook) does not show a peak at this mass. Explain.
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Our data indicates that this problem or a close variation was asked in Chemistry: The Central Science - Brown 13th Edition. You can also practice Chemistry: The Central Science - Brown 13th Edition practice problems.