isotope

From the prefix iso- +‎ Ancient Greek τόπος (tópos, “place”), because the different isotopes of a chemical element always occupy the same position in the periodic table of elements. The term was coined in 1909 by Scottish doctor Margaret Todd and first used publicly on February 27, 1913 by English chemist Frederick Soddy.

• (Received Pronunciation) IPA^(key): /ˈaɪ.sə.təʊp/
• (US) enPR: ī'sətōp, IPA^(key): /ˈaɪ.sə.toʊp/

• Audio (US)

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isotope (plural isotopes)

1. (physics) Any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei. As a consequence, atoms of isotopes will have the same atomic number but a different mass number.

Technically, isotopes are nuclides having the same atomic number but different mass number. In practice, the term isotope is often used instead of nuclide.

• isobar
• isotone

Possible back-formation from isotopy.

• (US) IPA^(key): /ˈaɪ.sə.toʊp/

isotope (third-person singular simple present isotopes, present participle isotoping, simple past and past participle isotoped)

1. (topology, transitive) To define or demonstrate an isotopy of (one map with another).

• homotope

• pooiest, pooties

• IPA^(key): /i.zo.tɔp/

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isotope (plural isotopes)

1. isotopic (relating to isotopes)

isotope m (plural isotopes)

1. isotope

• “isotope” in le Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

isotope

1. inflection of isotop:
   1. strong and mixed nominative and accusative feminine singular
   2. strong nominative and accusative plural
   3. weak nominative all-gender singular
   4. weak accusative feminine and neuter singular

isotope

1. vocative singular of isotopus