Which is not radioactive?
Correct answer: D. All of these
- A. Ozone
- B. Hydrogen
- C. Sodium
- D. All of these
Explanation
Ozone, Hydrogen and Sodium are all not radioactive because they have stable nuclei. A substance is said to be radioactive if it contains unstable nuclei and is able to naturally release energy in the process of shedding high speed charged particles, in an attempt to reach a stable state. So, option D is correct.
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