Which one of the following is not the mono isotopic element ?
Correct answer: B. uranium
- A. arsenic
- B. uranium
- C. iodine
- D. nickel
Explanation
A mono-isotopic element has only one naturally occurring isotope. Arsenic is mainly 75As and iodine is 127I, whereas uranium occurs naturally as several isotopes, especially 238U, 235U, and 234U. The likely mistake is choosing d because nickel has several isotopes, but uranium is also clearly not mono-isotopic.
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