Phosphorus-32 is a radioisotope used in the treatment of leukemia and pancreatic cancer. If the amount of radioactive phosphorus-32 in a sample decreases from 1.2 g to 0.30 g in 28 days, what is the half-life of phosphorus-32?

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A: Use the stoichiometric calculations as shown below:

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.