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27 September, 11:26

What type of radioactive decay results in uranium-238 becoming thorium-234?

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  1. 27 September, 11:54
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    The atomic number of U is 92 and for Th it's 90

    From 238 to 234 is a change in 4 of mass number.

    92 to 90 means 2 protons were lost.

    An alpha particle consists of 2 protons with a mass number of 4.

    That would be an alpha decay.
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