Example of radioisotope dating
Scientists call these different variations of the same element isotopes of each other. Radioactive refers to the characteristic that these isotopes are unstable and tend to fall apart.
For example, the element potassium (which always has 19 protons in its nucleus) occurs in nature in three forms: an isotope with 39 nucleons (19 protons and 20 neutrons), one with 40 nucleons (19 protons and 21 neutrons), and one with 41 nucleons (19 protons and 22 neutrons) . They emit, or radiate, particles in their conversion to stability. Isotopes exhibit a range of radioactive decay processes.
The amount of the isotope in the object is compared to the amount of the isotope's decay products.
Figure 1 provides a visual representation of an atom.Radiocarbon dating is one kind of radiometric dating, used for determining the age of organic remains that are less than 50,000 years old.For inorganic matter and for older materials, isotopes of other elements, such as potassium, uranium, and strontium, are used. Geologists use those radioactive isotopes to date volcanic ash or granite formations like the giant Half Dome in Yosemite National Park. Yes, radioactive isotopes present in rocks and other ancient material decay atom by atom at a steady rate, much as clocks tick time away.