isotope

From iso- (“equal”) +‎ -tope (“place”), because the different isotopes of a chemical element always occupy the same position in the periodic table of elements. The term was coined by Scottish doctor Margaret Todd in 1909 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)

  (file)

isotope (plural isotopes)

1. (nuclear 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. Thus, isotopes 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/

• Audio (Paris)

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isotope (plural isotopes)

1. (relational) isotope; isotopic

isotope m (plural isotopes)

1. isotope

• → Romanian: izotop
• → Turkish: izotop

• “isotope”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

isotope

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

isotope

1. vocative singular of isotopus