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How do mass number and proton number change in alpha decay?
Serlo · “Radioaktivität”· CC BY-SA 4.0
Answer
When a helium nucleus is emitted, the mass number of the original nucleus decreases by 4 and the proton number by 2.
„Wird ein solcher Helium-Kern ausgesandt, reduziert sich damit die Massenzahl des ursprünglichen Kerns um 4 und die Protonenanzahl um 2.“Translation: When such a helium nucleus is emitted, the mass number of the original nucleus decreases by 4 and the proton number by 2.
Sourced from Serlo


