After 1 half-life, what percentage of the original number of parent atoms is left?  _______ (a number)

After 1 half-life, what percentage of the original number of parent atoms is left?  _______ (a number)

After 5 half-lives, what percentage of the original number of parent atoms is left?  _______ (a number)

After 3 half-lives, what percentage of the original number of parent atoms is left?  _______ (a number)

You have a 100 g sample of technetium-99 with a half-life of 6 hours. Calculate the percentage of the technetium-99 that will be left after 6 hours.

A pure sample of radioactive nuclide X decays into a stable nuclide Y.What is number of atoms of Ynumber of atoms of X after two half-lives