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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 same chemical …

  2. Isotope | Examples & Definition | Britannica

    Dec 12, 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 identical chemical …

  3. 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 mass …

  4. What Is an Isotope? Definition and Examples

    Sep 13, 2019 · Isotopes share the same chemical properties but may have different nuclear stability and physical properties. Some isotopes are stable, while others are radioactive and undergo decay. …

  5. 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 chemical …

  6. What is an Isotope? - ChemTalk

    What is an isotope? An isotope is an atom that has the same number of protons and a different number of neutrons. The atom is still considered the same element (still contains the same number of …

  7. 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.

  8. ISOTOPE Definition & Meaning | Dictionary.com

    ISOTOPE definition: any 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 …

  9. What Is an Isotope? A Simple Definition and Explanation

    Aug 31, 2025 · Understanding isotopes sheds light on the subtle diversity within the atomic world. Isotopes are different versions of the same chemical element. They are atoms with the same number …

  10. ISOTOPE | definition in the Cambridge English Dictionary

    Add to word list physics, chemistry a form of an atom which has a different atomic mass from other forms of the same atom but the same chemical structure (Definition of isotope from the Cambridge …