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Question
What changes occur in the nucleus of a radioactive element when it emits an alpha particle. Give one example, in support of your answer.
Solution
\[\ce{^A_ZX -> {^{A-4}_{z-2}Y} + ^4_2He}\] (α - particle)
Compared to the original or parent nucleus, the resultant nucleus has 2 fewer protons and 2 fewer neutrons, for a total of 4 nucleons.
Example: \[\ce{^238_92U -> ^234_90Th + ^4_2 He}\] (α - particle)
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