what are radioactive elements
List of Radioactive Elements. A radioactive element is one with an unstable nucleus, which radiates alpha, beta or gamma radiation and gets converted to a stable element. This article has a comprehensive list of radioactive elements and their properties.alf-life is the amount of time required, for half quantity of radioactive element to decay. For example C 14 has a half life of 5730 years. That is, if you take 1 gm of C 14, then half of it will have been decayed in 5730 years. In the list presented below, half-lives of all the radioactive elements are presented.