Problem: You just discovered a radioactive element with an atomic mass of 250 g/mol. A sample of 5.11 ng of it decays at a rate of 3.00 atoms per second. What is its half-life, in years? Use 6.022 x 1023 for Avogadro's number and 365.25 for the number of days in a year.

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You just discovered a radioactive element with an atomic mass of 250 g/mol. A sample of 5.11 ng of it decays at a rate of 3.00 atoms per second. What is its half-life, in years? Use 6.022 x 1023 for Avogadro's number and 365.25 for the number of days in a year.