Isotope

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Isotope

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1. On of several nuclides having the same number of protons in their nuclei, and hence belonging to the same element, but differing in the number of neutrons and therefore in mass number A, or in energy content (isomers). For example, ₆C₆¹², ₆C₇¹³, and ₆C₈¹⁴ are carbon isotopes. Small quantitative differences in chemical properties exist between isotopes. </dd>
2. A radionuclide or a preparation of an element with special isotopic composition (allobar) as an article of commerce, so called because of the principal use of such materials as radioactive tracers. </dd>
3. In common usage, a synonym for nuclide (not recommended). [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use