Cerium-143 is a radioactive isotope that decays to produce praseodymium-143. The half-life for cerium-143 is approximately 33 hours. If 12.5 g cerium-143 remains from a 100-g sample, which statement is true? Select all that apply. A.
Cerium-143 decayed for 132 hours.

B.
Cerium-143 decayed for 99 hours.

C.
Four half-lives have passed.

D.
Three half-lives have passed.

E.
Cerium-143 decayed for 166 hours.

F.
Two half-lives have passed.