Question

Uranium-238 undergoes alpha decay. Therefore, uranium-238 will increase,decrease,stay the same or none of the above

Answer 1

Decrease

Explanation:

When a U-238 nuclei undergoes alpha decay, the nuclei will decrease substantially.

An alpha particle will cause a decrease in the mass number of the nuclei by 4 and the atomic number by 2.

  The reaction is shown below;

                       ²³⁸₉₂U   →  ²³⁴₉₀Th   +   ⁴₂He

We see that during an alpha decay, the mass number changes from 238 to 234 and that atomic number from 92 to 90.

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