Which of the following isotopes has the longest half-life?
A)Iodine-131
B)Iron-59
C)Phosphorus-32
D)Cobalt-60

Name: Which of the following isotopes has the longest half-life? A)Iodine-131 B)Iron-59 C)Phosphorus-32 D)Cobalt-60
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Quizplus · Accepted Answer

Cobalt-60 has the longest half-life among the options listed, with a half-life of about 5.27 years. Iodine-131, Iron-59, and Phosphorus-32 have significantly shorter half-lives of approximately 8 days, 44.5 days, and 14.3 days, respectively.

Which of the Following Isotopes Has the Longest Half-Life