Question

which statements best describe half - lives of radioactive isotopes? check all that apply. the half - life varies depending on the isotope. the half - life is the same for every isotope. half - lives are always only minutes long. half - lives range from fractions of a second to billions of years. the half - life of a particular isotope is constant. the half - life of a particular isotope changes constantly.

Explanation:

The half - life of a radioactive isotope is the time it takes for half of the atoms of a radioactive sample to decay. Different isotopes have different half - lives, which can range from fractions of a second to billions of years. Once an isotope is identified, its half - life is constant under normal conditions.

Answer:

The half - life varies depending on the isotope.
Half - lives range from fractions of a second to billions of years.
The half - life of a particular isotope is constant.