What is a radioisotope?

An unstable isotope that decays over time.

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  1. A stable atom that never changes
  2. A molecule that absorbs light
  3. An unstable isotope that decays over time ✔

Why: Radioisotopes are unstable isotopes that decay, with half-lives from fractions of a second to trillions of years.

Huh, didn't know that: Radioisotopes are unstable isotopes that decay, with half-lives from fractions of a second to trillions of years.

The dad joke
Radioisotopes are unstable and not shy about it.
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References

Answer: An unstable isotope that decays over time. Radioisotopes are unstable isotopes that decay, with half-lives from fractions of a second to trillions of years.

  1. Nuclear physics en.wikipedia.org/wiki/Nuclear_physics
    thousands of isotopes have been characterized as unstable
    Checked 2026-11-07.

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