When a nucleus of emits one -particle followed by two particles, what is the resulting daughter nucleus?
Answer and explanation
Correct answer: C.
- Step 1: Alpha decay () reduces the mass number by 4 and atomic number by 2: .
- Step 2: Each beta-minus decay () increases atomic number by 1 without altering mass number .
- Step 3: Emitting two particles increases from to : . The daughter nucleus is (an isotope of uranium).
Answer
.
Why not the others: is the product after only -decay without the two decays; does not reduce the mass number; reduces mass by 2 instead of 4.
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