This is the second lesson in a three-lesson series about isotopes, radioactive decay, and the nucleus.The first lesson, Isotopes of Pennies, introduces the idea of isotopes.Since its radioactivity presents a serious health hazard (see radiation sickness), disposing of such material is a great problem......actinide series,a series of radioactive metallic elements in Group 3 of the periodic table.
Nuclei with radii that are within the range of the Strong force are stable.
Geological processes have helped to create many iconic features on Earth.
Processes, such as plate tectonics, are what shapes the face of the Earth.
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.