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  1. Isotope - Wikipedia

    From left to right, the isotopes are protium (1 H) with 0 neutrons, deuterium (2 H) with 1 neutron, and tritium (3 H) with 2 neutrons. Isotopes are distinct nuclear species (or nuclides) of the …

  2. Isotope | Examples & Definition | Britannica

    Oct 31, 2025 · What is an isotope? An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly …

  3. What Is an Isotope? Definition and Examples

    Sep 13, 2019 · An isotope is one of two or more forms of an element that have the same number of protons but different numbers of neutrons in the nucleus. Because they have the same …

  4. What is an Isotope? - ChemTalk

    In this concept tutorial, learn about what an isotope is, some common isotopes and their uses, and how isotopes form and breakdown.

  5. What Are Isotopes? Atomic Structure and Isotope Notation …

    Learn what isotopes are, how they differ by neutrons, and how to write isotope notation in this clear, student-friendly chemistry lesson.

  6. Isotope Basics | NIDC: National Isotope Development Center

    Isotopes are atoms of the same element that have the same number of protons (i.e., atomic number, "Z") but a different number of neutrons, meaning that their mass number, "A", varies. …

  7. Isotopes: Definition, Meaning, Examples, Uses - Scienly

    Sep 22, 2024 · Definition: Atoms of an element which have the same atomic number but different mass numbers are called isotopes of that element. These isotopes are variants of the same …

  8. What are Isotopes? | IAEA

    Aug 19, 2022 · Like everything we see in the world, isotopes are a type of atom, the smallest unit of matter that retains all the chemical properties of an element. Isotopes are forms of a …

  9. 4.18: Isotopes - Chemistry LibreTexts

    Isotopes are atoms that have the same number atomic number, but different mass numbers due to a change in the number of neutrons. The three isotopes of carbon can be referred to as …

  10. ISOTOPE Definition & Meaning - Merriam-Webster

    The meaning of ISOTOPE is any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or …