Question

which statement accurately describes a half - life? a rocks size is determined by half - life. all stable and unstable elements have a half - life. an atom of an element becomes half its original size in a half - life. a half - life is the time required for half of a radioactive element to decay.

Explanation:

Half - life is a concept in radioactivity. It is defined as the time it takes for half of the atoms of a radioactive element to decay. Stable elements do not decay and thus do not have a half - life. Also, half - life has nothing to do with the size of a rock or an atom becoming half its original size.

Answer:

A half - life is the time required for half of a radioactive element to decay.