Question

Which of the following isotopes of uranium is unstable?

• A. U-234
• B. U-235
• C. U-238
• D. All of the above

Answer 1

The correct option is D All of the above

D. All of the above

All three naturally- occurring isotopes of uranium ( U-238, U-235, U-234) are unstable. On the other hand, those isotopes ( except U-234) belong to primordial nuclides, because their half - life is comparable to the age of the Earth.