Radioactive tungsten-178 decays with a half-life of 21.6 days. (a) What is the value of k in s"17 (b) A sample contains 29.0 mg 178w. How many decay events will be produced in the first second? Assume that the atomic mass of 178w is 178. decay events (c) A chemist obtains a fresh sample of 178w and measures its radioactivity. She then determines that to do an experiment, the radioactivity cannot fall below 50.0% of the initial measured value. How long does she have to perform the experiment? days

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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.