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The lighter elements do not show any radioactivity because the nuclei of lighter elements contain nearly equal number of protons and neutrons. On the other hand, the nuclei of heavier elements (elements having higher atomic numbers), contain more neutrons than protons
The lighter elements do not show any radioactivity because the nuclei of lighter elements contain nearly equal number of protons and neutrons. On the other hand, the nuclei of heavier elements (elements having higher atomic numbers), contain more neutrons than protons