Final answer:
The term for the element described is Uranium-235 (U-235), a dense radioactive metal used in nuclear reactors for its radiation energy.
Explanation:
Uranium-235 (U-235) is the correct term for the element described in the question. It is a dense gray radioactive metal used as fuel in nuclear reactors. It is named after the Greek god of the sky and is primarily used for its high-energy radiation and heat emission during fission reactions.
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