Which of the following statements regarding radiation are FALSE?
A) Radioactivity is a natural part of our environment.
B) All elements heavier than bismuth are radioactive.
C) All radioactive elements are spontaneously decaying towards formation of a stable element.
D) The time for half of the original sample to spontaneously decay is called the half-life 
E) All of the above are true.
Correct Answer:
Verified
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