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Current methods include using the known decay rates of radioactive isotopes present in rocks to measure the time since the rock was formed.Before class begins, prepare five bags filled with about 100 beads each.The bag itself represents the fossil and the beads inside represent some of the millions of atoms that make it up.As scientists, their job is to count the number of parent and daughter isotope atoms in each bag, and from this data to determine how many half-lives the isotope has gone through and therefore the age of the rock.Each atom has a positively charged nucleus surrounded by negatively charged electrons.The electric force between the nucleus and electrons holds the atom together.Radioactive isotopes are unstable and undergo spontaneous nuclear reactions, emitting particles and/or wavelike radiation.

When an element has atoms that differ in the number of neutrons, these atoms are called different isotopes of the element.Elements with various numbers of neutrons are called isotopes of that element. Note that some elements have both radioactive and non-radioactive isotopes. Radioactive decay occurs by releasing subatomic particles and energy.Isotopes are important for radiometric or age dating. Example: As uranium undergoes radioactive decay, it releases subatomic particles and energy, and ultimately decays to form lead.In the example above, uranium is the parent element, and lead is the daughter element.In the above table, note that the number is the mass number (the total number of protons plus neutrons).

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