How much of a radioactive element becomes stable in ONE half-life?

Question

a
Half of the original amount of atoms
b
None of the atoms will become stable
c
All of the original amount of atoms

Answer 1

The correct answer is:

a Half of the original amount of atoms

In one half-life, half of the radioactive atoms of a given element will have decayed into stable forms (or other radioactive forms). This is a fundamental concept in the study of radioactive decay.