The half-life of the radioactive element unobtanium-29 is 20

Last updated: 7/21/2022

The half-life of the radioactive element unobtanium-29 is 20 seconds. If 80 grams of unobtanium-29 are initially present, how many grams are present after 20 seconds? 40 seconds? 60 seconds? 80 seconds? 100 seconds? The amount left after 20 seconds is grams.