PH-2111
Radioactive decay
Physics · Secondary 4 · Easy · Radioactive decay
A nucleus of a radioactive isotope emits an alpha-particle. Which change occurs in its nucleon (mass) number and proton number?
- Mass number −2, proton number −2
- Mass number −4, proton number −2
- Mass number −4, proton number −4
- Mass number −2, proton number −4
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