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A half-life of a radioactive substance is the amount of time needed for one half of _____ to decay into a stable isotope.
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A half-life of a radioactive substance is the amount of time needed for one half of _____ to decay into a stable isotope.

User IlyaMuravjov
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Answer: The molecules

Step-by-step explanation:

A half-life describes the time it takes for half of the molecules to turn into a stable isotope

User Jacqui Gurto
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