This is a list or table of elements that are radioactive. Keep in mind, all elements can have radioactive isotopes. If enough neutrons are added to an atom, it becomes unstable and decays. A good example of this is tritium , a radioactive isotope of hydrogen naturally present at extremely low levels.
What is Radioactive Equilibrium – Definition
Radioactive dating - definition of radioactive dating by The Free Dictionary
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Radiometric dating , radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon , in which trace radioactive impurities were selectively incorporated when they were formed. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. Together with stratigraphic principles , radiometric dating methods are used in geochronology to establish the geologic time scale. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.
Our ancestors measured the passing of time with water clocks or hourglasses. Nature has none of our modern watches. It measures time -like our ancestors - by using hourglasses provided by radioactivity.