What Are Radioactive Isotopes (radionuclides)

The video tutorial explains that the identity and chemical properties of an atom are determined by the number of protons in its nucleus. Neutrons act as nuclear glue, preventing protons from repelling each other. Isotopes are variations of elements with different neutron numbers, common in heavier elements. Hydrogen has three isotopes: protium, deuterium, and tritium. Stability in isotopes varies, with unstable ones undergoing radioactive decay. Radioisotopes have applications in medicine, such as tracers and cancer treatment. The video concludes by summarizing that isotopes have the same chemical properties, with some being stable and others radioactive.

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