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Which of the following is a best nuclear fuel?

1. Thorium 236
2. Plutonium 239
3. Uranium 236
4. Neptunium 239

Correct answer: Plutonium 239

Solution

Plutonium-239 is a fissile isotope, meaning it readily undergoes fission with slow neutrons and releases a large amount of energy. The other options are not as suitable as nuclear fuel because they are either not commonly fissile or are less practical as fuel isotopes.

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