Cesium-137 is radioactive and has a half life of 30. years. How much of a 9.90 mg sample would be left after 135. years? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. ? TO THE n

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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.