A nuclide is the class of atomic nuclei with a specified number of protons and neutrons. Collectively, all the isotopes of all the elements plus the neutron form the set of nuclides. Isotope emphasizes that two or more nuclides have the same proton number (atomic number) and therefore are of the same chemical element e.g. the element carbon has several isotopes (carbon-12, carbon-13 and carbon-14). Chemical properties are changed little by a change in the number of neutrons. Nuclide emphasizes nuclear properties, which can change drastically with change in either number of protons, number of neutrons, or excitation state. However, since isotope is the older term, it is better known, and the word is still sometimes used even in nuclear technology and where nuclide would be more proper.

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