Question

note: to answer some of the questions, it may help to reference a periodic t
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when is an isotope considered stable? (select all that apply.)
the isotope’s half - life is too long to be measured.
the isotope does not emit a form of radiation.
the isotope emits some form of radiation.
the isotope’s half - life is longer than the average human life.

Explanation:

A stable isotope does not decay into other elements over time. This means it does not emit radiation. Also, if an isotope's half - life is too long to be measured, it is considered stable as it essentially does not change in a measurable time frame. Just having a half - life longer than the average human life is not the strict criterion for stability. Stable isotopes do not emit radiation, so the option about emitting radiation is incorrect.

Answer:

The isotope’s half - life is too long to be measured.
The isotope does not emit a form of radiation.