The half-life of a radioisotope is
A) the time it takes for the radioisotope to become an isotope with one-half the atomic number of the original radioisotope.
B) the time it takes for one-half of the sample to decay.
C) the time it takes for the radioisotope to become an isotope with one-half of the atomic weight of the original radioisotope.
D) the time it takes for the radioisotope to lose one-half of its neutrons.
E) one-half of the time it takes for the radioisotope to completely decay to a nonradioactive isotope.
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