Isotope

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  • Any two or more forms of an element having identical or very closely related chemical propeties and the same atomic number but different atomic weights or mass numbers.
    Source: U.S. Nuclear Regulatory Commission
  • One of two or more forms of an element that have the same number of protons (atomic number) but differing numbers of neutrons (mass numbers). Radioactive isotopes are commonly used to make DNA probes and metabolic tracers.
  • A variation of an element that has the same atomic number of protons but a different weight because of the number of neutrons. Various isotopes of the same element may have different radioactive behaviors, some are highly unstable..
    Source: Terms of the Environment


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