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In the following decay process: 238/92 U → x₁ → 234/90 Th → x₂ → 234/91 Pa → x₃ → 230/90 Th, x₁, x₂, x₃, and x₄ represent the particles or radiation released at each step. Which of the following statements is accurate?

1. (1) x₃ corresponds to γ radiation
2. (2) x₂ represents a β⁻ particle
3. (3) Z is a uranium isotope
4. (4) x₁ is deflected toward a negatively charged plate

Correct answer: (3) Z is a uranium isotope

Solution

The decay process starts with uranium-238, which is an isotope of uranium. The statement that Z is a uranium isotope is correct because uranium-238 is the parent isotope in this decay chain.

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