Uranium-238 (atomic number 92) emits an alpha particle. What is the daughter nucleus?
Answer and explanation
Correct answer: D. Thorium-234
- Step 1: An alpha particle carries 2 protons and 2 neutrons. Step 2. Mass number and atomic number , which is thorium. Answer: Thorium-234. Why not the others: The mass number must drop by 4; atomic number 93 would be beta decay; atomic number 88 would lose four protons.
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