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Competency #5

• Analyze atomic structure in terms of the Bohr model

Learning Objective d

• d. Describe how the average atomic mass (found on the periodic table for each element) is calculated

Question

Write down your answer to the following question:

There are two naturally occurring isotopes of chlorine (Cl): chlorine-35 and chlorine-37.
Look at the average atomic mass of chlorine on the periodic table to help you decide which of the following would best describe the relative abundances of these isotopes.

1. There must be approximately 50% of each isotope
2. There must be approximately 25% chlorine-35 and 75% chlorine-37
3. There must be approximately 75% chlorine-35 and 25% chlorine-37
4. You cannot figure this out with the given information

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