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Smile09
A) Hydrogen
Plutonium is used in nuclear reactors, and Uranium in nuclear fission.
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Answer:

Hydrogen

Explanation:

Hydrogen is often used in fusion reactions

4 ¹₁H  --> ⁴₂He +  2⁰₁e

Four hydrogen atoms undergo fusion reaction to form helium and 25 MeV( mega electron volt) of energy. Fusion reaction also occurs with isotopes of hydrogen such as deuterium and tritium.

²₁H + ²₁H  --> ⁴₂He

²₁H + ³₁H  --> ⁴₂He +  ¹₀n

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