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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

    Sep 3, 2025 · isotope, 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 identical chemical behaviour but …

  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. 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. …

  6. What are Isotopes? | IAEA

    Aug 19, 2022 · Isotopes are forms of a chemical element with specific properties, retaining all the chemical properties of the element.

  7. DOE Explains...Isotopes - Department of Energy

    Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. The number of protons in a nucleus determines the element’s …

  8. 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 …

  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 Notation — Overview & Examples - Expii

    Isotopes are atoms that have the same atomic number but different mass numbers due to the different number of neutrons they contain. There could be two or more isotopes that fall under …