Explain a radioactive nuclear phenomenon ?

Explain a radioactive nuclear phenomenon ?
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Radioactivity is a nuclear phenomenon. 72. The elements after the atomic number of the periodic table have very large number of orbits , electrons and protons, so they behave unstable. As a result, radioactive rays are emitted in their nucleus through bitumen and the element becomes somewhat stable. Since radioactive rays are emitted from the nuclei of radioactive elements , radioactivity is a nuclear phenomenon.
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