Complete these sentences by selecting the correct answers from the drop-down menus. After one half-life,___ % of the atoms will change to a stable isotope and___% will remain radioactive.

After three half-lives,___% of the atoms will change to a stable isotope and___ % will remain radioactive

A__ is two or more substances that are together in the same place but are not chemically combined

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon? a balloon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?