• Isotopes of some elements are radioactive.
• Radioactive isotopes have unstable nuclei which breakup and emit radiations.
• Nucleus if these isotopes contain extra number of neutrons than in the number of protons.
| Isotopes of certain elements with unstable nuclei which breakup to give off one or more types of radiation are known as radioactive isotopes. |
→ Radioactive isotopes can emit:
• Alpha particles
• Beta particles
• Gamma rays
E.g. of radioactive isotopes: hydrogen-3(Tritium), carbon-14, uranium-235
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