Alpha decay 

²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He

More usually written as

²³⁸U → ²³⁴Th + α

Note that an alpha particle is a helium nucleus, and that both mass number and atomic number are conserved. Essentially alpha decay can be thought of as nuclear fission where the parent nucleus splits into two daughter nuclei.

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