Home › Tamil Nadu SSLC (Class 10) › Physics › Nuclear Physics › Elements normally show natural radioactivity whe…
Elements 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_
Related questions
Artificial (induced) radioactivity was first discovered byWhich protective measure is recommended while handling hazardous radioactive materials?The age of fossils and old monuments is estimated using which technique?Which radioisotope is used to diagnose and treat anaemia?Using Einstein's relation, the energy released when a mass defect of 2 kg is fully convertA specimen emits 3.7 x 10^3 GBq per second. Expressed in curie, this activity equals (1 cuWhat is the SI unit of radioactivity?Which material is commonly used as control rods in a nuclear reactor to absorb neutrons?