If a lab reports there are the same number of daughter as parent atoms, the number of half-lives elapsed are 1,2,3, or 4?
You can think of half-life as the time it takes for half of a given amount of radioactive material to decay into another element. The radioactive element is the parent, the product is the daughter. To put it in simple terms, fill a room ...
Determining the number of half-lives elapsed by the number of daughter atoms present.