SEARCH Articles Figures Tables Alpha particle A helium nucleus produced in radioactive decay Atoms, nucleus radioactive Helium nuclei from radioactive decay Nucleus Radioactivity Nucleus radioactive decay Nucleus, atomic radioactive decomposition RADIOACTIVITY RESULTS FROM AN IMBALANCE OF FORCES IN THE NUCLEUS Radioactive decay The form a different nucleus Radioactive decay The spontaneous decomposition of a nucleus Radioactive isotope, number nuclei Radioactive nuclei, decay rates The Nucleus and Radioactivity Unstable Nuclei and Radioactive Decay