This exercise uses the radioactive decay model. Radium-221 has a half-life of 30 sec. How long will it take for 82% of a sample to decay

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.

The answer is not c