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One of two or more atoms having the same atomic number but different mass numbers.

[iso- + Greek topos, place (so called because the isotopes of a chemical element occupy the same position in the periodic table of elements).]

i′so·top′ic (-tŏp′ĭk) adj.
i′so·top′i·cal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.isotopic - of or relating to or having the relation of an isotope
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