Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life of chromium-51 is 27.7 days. If you begin with 79.2 milligrams of chromium-51, how many milligrams will you have left after 139 days have passed? mg Radioactive radon-222, found in many homes, is a potential health hazard. The half-life of radon-222 is 3.82 days. If you begin with 88.8 milligrams of radon-222, how many milligrams will you have left after 11.5 days have passed? mg Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9 hours. How many milligrams of a 52.3 milligram sample of thallium-201 will be lost by radioactive decay during 219 hours? mg

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A: The explanation is given below-

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A: As per bartleyby guidelines i answered only first question so please don't mind.thanks in advance.

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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.