Radiometric dating of potassium
Atoms of the same element that have different numbers of neutrons are called isotopes. Most carbon on Earth exists as the very stable isotope carbon-12, with a very small amount as carbon-13.
It can be used on objects as old as about 62,000 years.Gli elementi possono esistere in diversi isotopi, cioè possono differire per peso atomico, ovvero nel numero di neutroni nel nucleo.Un determinato isotopo di un elemento è detto nuclide.Radioactive dating is a method of dating rocks and minerals using radioactive isotopes.This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Some do not change with time and form stable isotopes (i.e.