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The half-life of a certain radioactive isotope is 3.24 years. If a sample consisting of 6.023x1023...

The half-life of a certain radioactive isotope is 3.24 years. If a sample consisting of 6.023x1023 atoms were allowed to decay, what percentage of the original number of atoms have decayed after 2.0 years?

A) 50

B) 46

C) 32

D) 54

E) 60

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