Lab 4 Radioactive (absolute) dating As it explained earlier. dating o.docx - Lab 4 Radioactive(absolute dating As it explained earlier dating or

Lab 4 Radioactive (absolute) dating As it explained earlier. dating o.docx

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Lab 4 Radioactive (absolute) dating As it explained earlier. dating or ondering of rock units deposition or geological events can be done either by relative dating or by radiometric or radioactive dating. RADIOMETRIC DATING is the process by which the absolute ne of a rock or geologic event is determined. This is done using radioactive ISOTOPES, which are composed of ATOMS having the SAME NUMBER OF PROTONS but NOT having the SAME NEUTRON NUMBER, such as, Uranium (U), Potassium (K), Rubidium (Rb), and Thorium (Th), which are called PARENT ISOTOPES, and desay by emitting nuclear particles. In the decay process they are transformed into new isotopes of different elements called DAUGHTER PRODUCTS, Eventually, all radianctive isotopes decay to a stable daughter isotopes. For example, parent uranium isotopes decay through a series of steps to isotopes of lead and parent potassium isotopes decay to calcium and argon. ATOMIC NUMBER: is the number of protons in the nucleus of an atom written as the subscript of the atom. If it is changed a new element is produced ATOMIC MASS NUMBER: is the sum of the number of protons and neutrons in the nucleus of an atom written as the superscript of the atom. If it is changed no new elements are produced but a new isotope of the element is produced. 238 Atomic mass number 92 -_ Atomic number Radioactive decay proceeds in three different ways: 1. ALPHA DECAY: The nucleus of an atom emits an alpha particle which is composed of two protons and two neutrons. This loss changes the atomic mass number and also the

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