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Radiochemical dating examples

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This atomic number is ordinarily given the symbol Z.The great importance of the atomic number derives from the observation that all atoms with the same atomic number have nearly, if not precisely, identical chemical properties.

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The isotopes of an element have the same number of protons in their atoms (atomic number) but different masses due to different numbers of neutrons.In fact, it is precisely the variation in the number of neutrons in the nuclei of atoms that gives rise to isotopes. The three share the place in the periodic table assigned to atomic number 1 and hence are called isotopes (from the Greek isos, meaning "same," and topos, signifying "place") of hydrogen.Many important properties of an isotope depend on its mass.Bone cancer pain palliation (improves the quality of life), cellular dosimetry, treatment of prostate cancer, treatment of multiple myeloma, osteoblastic therapy, potential agent for treatment of bone metastases from prostate and breast cancer (E). Brain, heart, liver (gastoenterology), lungs, bones, thyroid, and kidney imaging (C), regional cerebral blood flow (C), equine nuclear imaging (C), antibodies (C), red blood cells (C), replacement for Tl-201 (C). A large collection of atoms with the same atomic number constitutes a sample of an element.

A bar of pure uranium, for instance, would consist entirely of atoms with atomic number 92.

In an atom in the neutral state, the number of external electrons also equals the atomic number.

These electrons determine the chemistry of the atom.

References: A = June 1996 Society of Nuclear Medicine (SNM) Abstracts B = Holmes, R.

Isotopes | Stable & Unstable | Applications | Definitions | Diagnosis | Radiotherapy | Biochemical Analysis Diagnostic/Therapeutic Radiopharmaceuticals | Discovery | Isotopes in Medicine | Terms & Concepts An isotope is one of two or more species of atoms of a chemical element with the same atomic number (same number or protons in the nucleus) and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties. An atom is first identified and labeled according to the number of protons in its nucleus.

The specification of Z, A, and the chemical symbol (a one- or two-letter abbreviation of the element's name, say Sy) in the form A/ZSy identifies an isotope adequately for most purposes.