Which of the following features is NOT a characteristic of natural radioactivity?
-
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