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isotope (noun) one of two or more forms of a chemical element.
An isotope is one of the forms of a chemical element with different physical properties but with the same chemical properties.
- Because of the many isotopes of carbon we find life very convenient. Its different isotopes are useful for us as food, fuel, power, etc..
- The discovery of the isotopes of radioactive materials like uranium, plutonium, etc., has led to the development of nuclear energy.