Which of the following is a radioactive substance?
Correct answer: D. All of the above options are correct
- A. Uranium
- B. Radium
- C. Thorium
- D. All of the above options are correct
Explanation
Substances that disintegrate (or decay) by the spontaneous emission of radiation are called radioactive substances. For example, uranium, radium, polonium, thorium, actinium, etc. As explained above all the options are correct.
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