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When a radioactive nucleus emits a beta particle, the daughter nucleus has
Athe same mass number and atomic number lowered by one
Bthe same mass number and atomic number raised by one
Cmass number lowered by four and atomic number by two
Dboth mass number and atomic number raised by one
Answer & Solution
Correct answer: B. the same mass number and atomic number raised by one
1. A beta particle is an electron, carrying negligible mass.
2. So the mass number of the nucleus is unchanged in beta decay.
3. By Soddy-Fajan's law the atomic number increases by one.
4. Option C describes alpha decay, which is different.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 6 Nuclear Physics "Nuclear Physics", p.84_
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