Back Radio-aktiewe verval Afrikaans إشعاع نووي Arabic Desintegració radioactiva Catalan Décroissance radioactive French 放射性崩壊 Japanese Vervalvorm LI Radioactief verval Dutch Radioaktiv stråling NN Radioaktiv stråling NB Jedrski razpad Slovenian
Radioactive decay happens to some chemical elements. Most chemical elements are stable. Stable elements are made up of atoms that stay the same. Even in a chemical reaction, the atoms themselves do not ever change.