If you have 40 grams of Au-198 how much Au-198 would be left after three half lives?

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.