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.

Different radioactive isotopes have different half-lives, and those values range from fractions of a second to billions of years. For any particular isotope, its half-life is constant; it does not change over time. Therefore, the correct statements are that half-life varies by isotope, spans a very wide range, and remains constant for a given isotope.

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