An atom with a fixed number of protons and electrons, usually used to distinguish one such atom from one with a different number of neutrons.
Atom, Isotope Effect, Isotopomer, Neutron, Proton, Radioisotope
References
Firestone, R. B.; Baglin, C. M.; and Shirley, V. S. Table of Isotopes, 8th ed. New York: Wiley, 1998.
Firestone, R. B. and Shirley, V. S. Table of Isotopes, 8th ed, 2 Vol. Set, 1998 Update. New York: Wiley, 1998.
Weisstein, E. W. "Books about Isotopes." http://www.ericweisstein.com/encyclopedias/books/Isotopes.html.
