which element has the greatest average atomic mass?\niodine\nbromine\ntellurium\nkrypton

Explanation:

Step1: Recall atomic - mass values

We need to know the average atomic masses of iodine, bromine, tellurium, and krypton. The average atomic mass of iodine ($I$) is approximately 126.90 amu, bromine ($Br$) is about 79.90 amu, tellurium ($Te$) is around 127.60 amu, and krypton ($Kr$) is about 83.798 amu.

Step2: Compare the values

Comparing 126.90 amu (iodine), 79.90 amu (bromine), 127.60 amu (tellurium), and 83.798 amu (krypton), we can see that 127.60 amu (tellurium) is the largest.

Answer:

tellurium