Final answer:
To identify the element based on its average atomic mass, choose ytterbium with an atomic mass close to 69.72 amu.
Explanation:
The identity of the element can be determined by comparing the average atomic mass given with the atomic masses of the options provided. In this case, the average atomic mass of 69.72 amu aligns with ytterbium, which has an atomic mass of around 173.05 amu. Therefore, the correct answer choice is ytterbium (Option 2).
Learn more about Isotopes and Atomic Mass here:
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