| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024i•so•tope /ˈaɪsəˌtoʊp/USA pronunciation n. [countable]- Chemistryone of two or more forms of a chemical element having the same number of protons, or the same atomic number, but having different numbers of neutrons, or different atomic weights.
i•so•top•ic /ˌaɪsəˈtɑpɪk/USA pronunciation adj. WordReference Random House Unabridged Dictionary of American English © 2024i•so•tope (ī′sə tōp′),USA pronunciation n. [Chem.]- Chemistryany of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. There are 275 isotopes of the 81 stable elements, in addition to over 800 radioactive isotopes, and every element has known isotopic forms. Isotopes of a single element possess almost identical properties.
- Greek tópos place
- 1910–15; iso- + -tope
Collins Concise English Dictionary © HarperCollins Publishers:: isotope /ˈaɪsəˌtəʊp/ n - one of two or more atoms with the same atomic number that contain different numbers of neutrons
Etymology: 20th Century: from iso- + Greek topos placeisotopic /ˌaɪsəˈtɒpɪk/ adj ˌisoˈtopically adv isotopy /aɪˈsɒtəpɪ/ n |