Which of the following features is NOT a characteristic of natural radioactivity?
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- A Radioactivity is a nuclear phenomenon
- B Radioactivity is exhibited only by elements of mass number greater than 206
- C The radioactivity of an element is affected by electric and magnetic fields in the surroundings
- D Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
- E The radioactive element is transformed into a new element
Correct Answer: Option B
Explanation:
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