Question

what occurs during one half - life?
o half of a daughter isotope undergoes radioactive decay to form a parent isotope.
o half of a parent isotope undergoes radioactive decay to form a daughter isotope.
o all of a daughter isotope undergoes radioactive decay to form a daughter isotope.
o all of a parent isotope undergoes radioactive decay to form a parent isotope

Explanation:

The half - life is the time it takes for half of the amount of a parent isotope to undergo radioactive decay to form a daughter isotope.

Answer:

Half of a parent isotope undergoes radioactive decay to form a daughter isotope.