Final answer:
Chlorine's average atomic mass is 35.5 amu, indicating the element in question is chlorine.
Explanation:
Chlorine has two naturally occurring isotopes, chlorine-35 and chlorine-37, with respective abundances of 75% and 25%. To calculate the average atomic mass of chlorine, multiply the abundance of each isotope by its mass and sum the results. In this case, the average atomic mass of chlorine is 35.5 amu, making the identity of the element in question chlorine.
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