Out of the following, nucleus of _____________ atom contains the largest number of neutrons?
Correct answer: D. U-239
- A. U-235
- B. U-238
- C. Pu-239
- D. U-239
Explanation
The neutron count is A − Z: U-235 has 143, U-238 has 146, U-239 has 147, and Pu-239 has 145. Therefore U-239 contains the most neutrons.
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