Which of the following features is NOT a characteristic of natural radioactivity?
Radioactivity is a nuclear phenomenon
Radioactivity is exhibited only by elements of mass number greater than 206
The radioactivity of an element is affected by electric and magnetic fields in the surroundings
Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
The radioactive element is transformed into a new element
Correct answer is B
Natural radioactivity is exhibited by elements of atomic numbers of 83 or more