Q:

In the following nuclear reaction, 92 238 2 4 U H → + X e , one of the products (2 4 He) is an alpha particle. What is the other product (X)?

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In the following nuclear reaction, 92 238 2 4 U H → + X e , one of the products (2 4 He) is an alpha particle. What is the other product (X)?


  1. 90234Th
  2. 91234Pa
  3. 21236Pa
  4. 90236Th

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A: Consider the mass numbers: 238 − 4 = 234. Then the atomic numbers: 92 − 2 = 90. Hence the nuclide X must be Thorium 234.

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