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The radioactive decay of uranium into thorium is expressed by the equation \( 92 U^{238} \rightarrow 90 T h^{234}+X \) Where \( X \) is

1. an electron
2. a proton
3. a deuteron
4. an alpha particle

Correct answer: an alpha particle

Solution

The radioactive decay of uranium into thorium involves the emission of an alpha particle, making option D the correct answer. [AI-generated key — verify before high-stakes use]

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