When uranium-238 emits an alpha particle, it transforms into thorium-234, resulting in a decrease of two protons.
After uranium-238 emits an alpha particle, it transforms into thorium-234 as the daughter isotope. The alpha particle contains two protons and two neutrons, leading to a decrease in the atomic number of the parent nucleus. In the case of U-238 decaying to thorium-234, the number of protons reduces by two.
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