Element with a 235 isotope (7)

I believe the answer is:

uranium

(Other definitions for uranium that I've seen before include "Mineral used in nuclear reactors" , "Fissile element" , "Radioactive metal, atomic number 92" , "Radioactive element used for nuclear energy" , "Chemical element used to get nuclear energy" .)

I've seen this clue in the King Feature Syndicate.

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