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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 Xaarth
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Answer:

The nucleus.

Step-by-step explanation:

When a substance is unstable, its bonds decay until it no longer can sustain itself. The half that decays, is released as a stable isotope, whereas the rest of the substance continues to decay.

User Shansal
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