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  1. List of Radioactive Elements and Their Most Stable Isotopes - ThoughtCo

  2. Radioactive isotope | Description, Uses, & Examples | Britannica

  3. Isotope Basics | NIDC: National Isotope Development Center

  4. List of elements by stability of isotopes - Wikipedia

  5. 17.1: Radioactive Isotopes - Biology LibreTexts

  6. Radioactive elements - Definition, Radioactive decay, List of ...

  7. 5.5 Isotopes of the Elements - Open Library Publishing Platform

  8. Isotopes and Nuclear Symbols Example Problem - ThoughtCo

  9. 2.3 Atomic Structure and Symbolism - Chemistry 2e - OpenStax

  10. 32.1: Radioactive Isotopes - Chemistry LibreTexts