alleryElements normally show natural radioactivity when their atomic number is
Aexactly equal to 8
Bless than 10
Cgreater than 82
Dbetween 1 and 5
Answer & Solution
Correct answer: C. greater than 82
1. Heavy nuclei are unstable and tend to decay spontaneously.
2. Elements with atomic number greater than 82 generally undergo natural radioactivity.
3. Light elements (small atomic number) are usually stable, so those options are wrong.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 6 Nuclear Physics "Nuclear Physics", p.82_
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