Multiple choice

Atomic mass of _______ is equal to the average atomic masses of chlorine and iodine.

  1. bromine

  2. fluorine

  3. astatine

  4. strontium
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A Correct answer
Explanation

Bromine is the middle element in the halogen triad consisting of chlorine, bromine, and iodine, where its atomic mass is approximately the average of the other two.

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