Multiple choice general knowledge science & technology

The isotope of uranium capable of sustaining chain reaction is

  1. U-235

  2. U-245

  3. U-239

  4. U-238
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A Correct answer
Explanation

U-235 is the naturally occurring fissile isotope of uranium capable of sustaining a chain reaction, making up about 0.7% of natural uranium. U-238 (99.3% of natural uranium) is not fissile. U-239 is an unstable decay product of neptunium-239, and U-245 does not exist in nature.

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