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← ScienceWhich outcome is observed when thorium-232 undergoes alpha decay?
A)Radium-228 emits a helium nucleus✓
B)Actinium-227 captures an electron
C)Protactinium-231 exhibits beta emission
D)Uranium-235 undergoes spontaneous fission
💡 Explanation
Alpha decay involves emission of a helium nucleus; therefore, thorium-232 transforms into radium-228 via radioactive decay because it emits an alpha particle; rather than transmuting into actinium, which requires beta decay.
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